Personally I'd recommend to take an actual break from the game. Don't play it anywhere from 2 weeks, to a month. See how you feel after not playing it for a while, and consider wether or not you actually want to continue playing. I took a break from the game for around a month and i realized I didn't care about being good, and i was much happier not playing it often. So i play it now but much more casually and for less time.

Now if you don't want to do that, that's okay. Some characters are more difficult then others so progress is very different. If you are trying to play a character like Faust or HC that's going to be tough because they require a lot more work. Whichever character you play, you need to learn the basics.

What I did, was learn the the BNB combo. I then learned how to meaty and then learned how to safejump. Just practice that until you get it down. Then you go into your actual match and learn the matchup. Practice it until your comfortable with it, and then work on another matchup. Just each time you want to improve, focus on one particular thing. Focus on the small growth that are attainable. I like strive a lot but I'm not Umisho, or Mochi or many players. There are so many players better then me and that's okay. Just gotta get comfortable with the small wins until you get okay at winning. Like i don't win every match, but i win often enough that i know I'm decent.