You don't need to draw everyday, you don't need to pay any real life teacher (cause they're often scammers with no qualifications and worse than youtube tips), you don't need to train your hand coordination or line quality to express shape because it's like saying that grammar is the most important skill to writing good plots (see example below)
not my art:
Drawing is an intellectual exercise, so practicing mechanical stuff while being exhausted sounds like sabotage to me.
Do you get worse at speedrunning sudoku if you don't solve a couple of them everyday? Probably, but you prolly won't forget how to solve it completely.
The only art that requires mandatory daily practice is Music interpreter (as opposed to composer), because their performance is in real time, and their brain circuit needs to be constantly oiled.
I believe that the fastest way to improve drawing is getting feedbacks from random people and/or guidance from experts (you can gain a lot of insight on seeing someone else take a spin at your art).
Less is more, don't be a try hard and let your curiosity guide you. When you run into a problem about anatomy or perspective, look at how other artists deal with it and copy them. Your way of looking at art will slowly change, just like when you read a book as a writer than as a pure consummer. At that time, you'll start gaining experience points passively just by looking at shit, but you do need practice to absorb your gains.
If you're a pervert, as long as your art makes you blush, you know you're on the right tracks. That's all you need to ascend to glory
