Hey Cypereze,
Just a quick one - It's always worth editing the videos to only show what you want feedback on (backhand in this case) - Even if the backhand points are only 1 minute combined, it saves having to watch 12 minutes of forehands 😅
Let's start with the good news!
You are clearly good enough to be able to improve your backhand consistency dramatically, and a lot of what you need is already there (you just need to unlock it!)
If I were you, I would focus on a small number of things to improve initially, rather than trying to fix everything in one go.
In no particular order......
1 - Bat position
Probably the hardest thing to do, as it's such a big part of our game is how we hold the bat.
I noticed that when you are thinking about blocking a ball, your bat goes vertical - It is often your "default" position, but you usually end up in a good position when playing a forehand attacking shot.
However, you seem to struggle more going from this vertical position to playing a good backhand.
Example photos below so you can see what I mean.
View attachment 25010
The above photo shows you on the back foot, with a decent racket position (good straight wrist), although it could be even straighter if you really wanted to (it feels uncomfortable when initially learning this).
Your next shot is a back foot attacking backhand which looks great.
View attachment 25011
This is how you look most of the time when blocking, and it's not optimal to go from this, to attacking (be that FH or BH).
Try and keep your wrist straighter (like the first pic), and get your head closer to the ball whilst bending your knees/getting lower.
By getting this fundamental thing right, I think it'll improve your positioning to be able to play better backhands.
2 - Practice, practice, practice
I know this is obvious, but I was in a similar position to you not too long ago.
Decent FH that I was always confident on, but a BH that I would rarely attack with, as I just didn't have the confidence to go for it.
I spent an entire summer playing practice matches against people, and pretty much tried to hit everything on my BH.
At the start, I would lose (quickly) to people I would normally beat with my eyes closed.
The points were short, because I'd miss on ball 2/3/4, but I kept on going for it.
By the end of the summer, I had SO much more confidence, that I took it into the league that year and never looked back.
It is clear from your videos that you have the ability to hit good shots on your backhand, and the main thing from stopping you is the thought of losing the point in one shot.
Your videos are 95% forehand - I want to see one that is 95% backhand 😊
3 - Get lower
Easy one to fix - Get lower.
Either spread your legs to give you a wider base (which brings your centre of gravity lower) - But you still need to be able to move quickly on your feet.
Or bend your knees more.
Too often, you are too tall/upright on your shots, and it's having a negative effect.
I was fully expecting to see a really trash backhand given your thread title 😂 but it's actually pretty solid when you are aggressive.
The big one is having that confidence to hit it continuously, rather than a big swing in a "hit and hope" sort of way.
Confidence comes with practice (lots of it) - Don't worry about losing easily in those practice games.
If you recorded another video, where you hit 95% backhands and then uploaded it to this thread, you might find some more in depth answers that would help.
Good luck!