Study on top of drawing completed stuff in paralel. Don't just learn by doing. Yes, you will level up by doing as long as you study up for the picture in question (using refs, etc.), but your progress will be incomparably slower compared to one you get by also actively studying. o v o'
Elaboration, aka, how you do the do:
1. Find the study material!
My top pick is Loomis for starters!(it works really well with learning for anime-like styles if you can extrapolate)
If books ain't your thing, there are free videos! (Example)
Or online courses like from Schoolism (if you got 15$ a month to spare on a subscription)
2. Buy/Bookmark/download/sign-up!In other words - get access to it! Unless you can open the thing in 2 gestures or 2-3 clicks, you haven't done this step properly!
3. Do it daily!D