Relearning Melty Blood Type Lumina

Not too long ago, I had been playing very well and accomplishing a lot of goals I had with this game. However, I recently have regressed extremely far and have been making constant mistakes. It has gotten to the point where any time I make a single mistake, I instantly get angry and frustrated which snowballs and I don't have fun playing the game. That being said, I would rather play this game and be angry then stop it for any period of time. I want to have fun with this game again, and I can't bring myself to take a break from it. So instead I'm going back to the basics and trying to go over every possible part of my gameplay and practice to hopefully stop myself from making dumb mistakes as often. Kinda worked kinda didn't.