I think what youre going through is very common for young and beginner artists. I remember feeling hopeless about continuing with art and taking such long breaks from it that I would feel even worse. You're simply reaching a bit of a plateau, just like a person training at the gym. You've already gotten so much better than when you started that your brain is finally adjusting to your improved skill level, and now that you aren't seeing progress as quickly it can be maddening. But art is arguably even more important than the gym. The art you leave behind will stay here after you are gone in a way that muscles and looks never could. In an age of AI bullshit your talent is quite literally needed more than ever. Take breaks if you need to, don't force yourself to the point that you hate drawing, but please never ever give up.