Since we saw the vid, there should be a few things to look at to make it simple.
In your division, especially against an opponent who likes to receive a serve 1 meter off table and retreat... WHY are you serving slow and deep long each serve? This kind of player LOVES it when you give him long balls, LESS he has to move. Why not use short serves 1/3 to 1/2 the time to keep him honest? The short serve, if you learn variation, will give you all kinds of setups to go on offense right away. Does ANYONE in your division spell short serve?
Also on serve, look how you do your ritual before serve (covering ball by tilting hand vertical... you bring hand to horizontal position for less than one second, cup the ball excessively (although cupping ball to a minor degree is legal as hand cannot be perfectly flat)... so you are not pausing long enough to present the ball in reasonable judgment... then you on majority of serves, dip hand holding ball a few cm below table top level. Serve fault... that umpire never called. Be aware of that, because one day, you will be in front of an umpire who knows, pays attention, or actually cares about service rules.
Look at where you are serving from... nearly center of table and what you serve (almost every time a long, slow serve near or witin a foot of endline)... and how you position yourself... it appears you aboslutely DO NOT want to open the point with yuor FH... from other points where ball comes back as light underspin, I see you make a reliable FH topspin opening on those... so why not do that with serve and first topspin? The way you are setup, you try to do a BH opener... Look at the entire vid and count how many times you opened from BH and actually landed it... it was NOT as high a total as you think. You made SO MANY ERRORS on BH... I do not understand why you are so dead-set to open with BH when it is not getting the job done for you. You may want to consider serving from BH corner, turning your body on serve and using your FH to open when you have the chance. Sure, having a good BH is a plus, keep that ready, but in this match, you GAVE AWAY SO MANY POINTS with your BH... That opponent every time was like "DONATION by Paypal ACCEPTED".
You made some errors on FH too, but it was mostly because (IMO) that you did not quite make the tiny adjustment to be in position crouched ready. The times the ball came to your FH (from your push or BH opener that actually landed) you made a reasonbly good percentage of FH topspin openers or attacks... for sure good enough ratio to use that weapon more often and favor it. You also made a LOT of points finishing with a strong FH. You missed some of those, but was obviously worth it to play that shot on those balls based on the ratio of FH shots attempted, landed, and won.
This opponent did not have much quality on defensive shots - it was pretty much get it back on the table at all costs... and at a certain level (well, EVERY LEVEL, but quality counts), that is a good policy. What the heck, priority number one should be getting the ball back on the table, because if that fails, priority 2 through 4 do not matter, right? yet, when the quality of return is so bad, it is practically POINT OVER when he returns those high gopher balls as we would call them in USA... and you DID finish a very high percentage of them. (with a strong FH)