Well, I'd say to learn bit by bit, and to learn the fundamentals especially!
Your drawings are pretty good tbh, it seems you have a very good understanding of shapes and linework, it's very good!
You seems to struggle with hands, so try to draw different common hand positions like these : 👍✊👊🤜🫵✋🖐️
Hands are actually pretty simple to draw when we know how they are structured :)
Try to work on proportions too, visualize how your drawing will fit on the paper too!
You seem to have very good bases so in my opinion with a little bit of studies you will be able to draw very well! :)
SLUSHIE-SWEETHEART
Not to get into the mindset that your art is bad. A better mindset is "My art isn't perfect yet but that's okay I'm learning and with every piece I make progress" look at the good in your art too, instead of "how I drew that hand sucks, I suck at art" think "There's room for improvement on how I draw hands, but the face looks really good!"
It's called a growth mindset if you praise the good and recognize what could use improvement but don't put your art down for it, you will improve (usually way faster too!)