I think you're taking drawing so seriously! In fact, taking it more silly is fine too. It's easy to burn out if you put too many expectations on yourself -- and (secretly) you learn a lot by drawing stuff that makes you excited and relaxed to draw, especially if you explore lots of different kinds of things that you enjoy.
Sometimes when you're just drawing stuff you enjoy, you'll hit points where you think "Oh, I'm really having trouble with this... (hands, eyes, water, cats, idk) ... I'll do some serious art studies of this for a little while." And it's a little easier, I think, to approach serious study when you want to know those things instead of letting it feel like a grind.
Everyone is different, it's fine to try lots of approaches.
But you absolute 30000% need to take care of yourself
you are more than halfway through the year and your art is developing all the time, so please give yourself scribbly/doodly rest days.
I'm always cheering for you. 