SL, a lot of stuff to write and I'll leave a few things for some others to comment upon.
When trying to make the first BH topspin vs an underspin ball, you are a bit too far from the table, you reach, and impact the ball way too far in front. That kills your control, your power, and any chance to land the ball more than 10% of the time.
When you coach made even a medium speed medium spin topspin at you, you retreated back more than a meter. Whassup? There is nothing wrong with holding the table and blocking if you need to do so. In fact, at your level, and maybe up to 3-4 divisions above you, it is a fact you can make many free points (or get the advantage in a rally that leads to the point) by angle blocking these medium topspin balls.Pros like to drop back a step or two and duke it out mid distance that first time someone opens the point, but you are likely to be better staying at teh table for now. Learn how to stay there and learn how to block and learn how to made 1/4-1/2 power counters, which will end up as very fast returns, if well placed, will also do the job.
The rare chance where you sucecessfully made a good topsin step-around FH, you were sightseeing, instead of getting back into position and watched Ur coach soft block it by you cross court. Don't sweat it, you will get better habits as you get better. I am still guilty of this every now and then too.
When you tried to stay close to the table and use your BH to medium counter to a good location, you put Ur coach under pressure and won at least 50% of points where you could make at least 2 or 3 BH counters. When you keep the tip of your racket up like you did those few points, you can get your BH into play very quickly and have good control. Even if the BH counter isn't a blazing fast or spinny shot, you took it off the bounce right away and applied time pressure to coach.
If you could manage to stay close to table some more and take balls earlier, you have a lot more possible angles opened up to you for whatever shot you want. Especially when blocking topsin, it is important to step to the ball and meet it right after the bounce for your best control, and advantage in the rally. You get better angles, better pressure, and more control doing that, and it also helps the next shot(s) as well become possible better quality, better power shots that can lead to winning the point.
A LOT of your impacts on BH wing are still way too far in front in all 3 matches, with the exception of a few BH counters at the table.
You seem to be in a rush to serve. Try not to rush into a failure, it won't help you. I think coach even told you about this in the vid somewhere.
You do not seem to have the three basic serves (topspin, cut, and knuckle with any degree of side) and three basic depths down yet. (Short, 1/2 long, and very deep near endline) You will have a much better offensive game if you can learn teh bat angles and timing for all these. it is something you have to practice. i reccomend starting by practicing off the table, lke when you are waiting for matches. You use a totally horizontal inpact, graze the ball, let it fly out a meter or two or three, and allow the ball to spin back to you on the wood floor. This is something that is simple to practice and will help your impact timing. You get the timing down, and when you learn the angles and stroke direction, you will be able to make a lot more serves. serving is SO IMPORTANT and you have a LOT of room to grow in this area. Practicing serves can get boring, but it is critical to your game. Serve and attack are maybe 1/3 of the game if you look at it simple. Good serves that limit opponet and get moar balls you expect and are attackable greatly increase the quality, power, spin, and landing percentage. I mean big-time. Right now, you are well under 50% serving and attacking, like nowhere near breaking even. With your current serves, you have abetter chance to win the point by serving, allowing attack by opponet, and defending/countering. Nothing wrong with some of that as defending and countering are important skills to develop, but in TT serving gives the server an immediate offensive advantage if you serve with a plan, get a ball to attack, and are ready.
When you decide to bump back your coaches cut serve, you are taking the ball really late. that is OK if you want to to safely return a ball you are not exactly sure of, but you send them back middle depth, which is the easiest ball for coach to rip back at you. He has a lot of options to attack that ball. When coach gives you a short or 1/2 long underspin serve, you should step in, then bump it with a loose wrist right off the bounce. You don't need much if any forward followthrough to get a short return. A variation is to step in, and bump it faster right off the bounce deep, an added bonus is if you can fake the wrist direction and change right at impact. You will break your coaches ankles doing that once you get good at it. coach will think you are fast pushing right at him, so he is already stepping around, then you redirect the ball to his wide FH with a quick underspin bump deep, he tries to change direction and snaps boths his ankles. Even if you cannot yet flick like coach, if you have an off the bounce fast push deep, a short bump, and a top of the bounce push to any direction, coach will have a more difficult time anticipating you, which will make him much less successful attacking you. That gives you your chances on offense if you are ready when coach passes up a low percentage chance and gives you a higher percetnage chance. If you are able to successfully take away his initiative a few times, it will get his attention for sure.
I am not going into the shot selection thing right now. You will grow as a player and learn which shots setup your offense and what your chances of making whatever shot are considering. Right now, unless you can make a 70% landing percentage on you offensive shots, your offense is NOT going to win you many points, unless opponent gives you the easiest of balls to finish as a gift. That is a tough reality when a TT player starts out his amature carreer. Unless EVERY offensive shot that lands is a WINNER, you need a minimum of 50% + landing percentage just to break even and dream about the offense being a point winningn machine. Since shots get blocked or countered, 70% becomes a rough guide for breaking even. That doesn't mean to avoid going for offensive shots in your matches, it just means that until your consistancy and quality get to a certain point, your offensive efforts will result in more lost points than won for a spell. That is a part of the game. Don't sweat it, when you learn shots, even if they are landing in practice, match situations are much different, and official tourneys are also a new world. It can take months for something you learned well in practice to land more than 70% in a match. You never make something above a 70%+ consistancy in amthc by avoiding trying it out in practice matches. That is why you do matchplay as part of your training. You will go through all kinds of phases where things work well in a match, then not so many things work well, even if overall, you are certainly improving in skill and level. There is alaways an up and down curve thing going on in your match performance as you learn and grow. It can get downright disheartening sometimes, but fight on TT Warrior. There are not many out there brave enough and determined enough out there in your population willing to do what you do and endure.
Even an attack-the-opponent-crazy-first-before-opponent-attacks-me-first kind of offensive player like me has to have other ways to win points besides spinning the logo paint off the ball and blasting 40 millimeter holes through opponents, then through walls. Spin variation is a wonderful tool at any level. so are tactics and changing things up, staying on balance. Defending is a good thing to have as well as countering. The bad reality is even at the top levels of my city, the points never go the way the athletes serving planned them even 1/2 the time. Similar skilled opponents close to equal will not be 100% predictable, even though you do learn some players' tendencies. Since points don't really get played out like you envisioned them, you adjust with other tools and use them to get advantages and win.
You have a great attitude throughout what are surely some very dissapointing results in many points. You smile through it. That is a very positive attitude. I remember reading Greg Letts write somewhere that "Grinners are Winners" You got that down already where soem others need improvement in that area.