Here some tip from Marc Brunet:
Have some sort of goals. This is to focus your efforts to where it fits you.
For instance, if you look at some arts and think "I really like that anatomy style, I want to learn how they do it", it will naturally direct your training towards it. That way you will never stagnate because you'll always have a 'problem' to solve. Things to consider in art are anatomy, perspective, environment, shading, color.
Dont have a time limit: it takes time to integrate new techniques and knowledge into your repertoire. You'll get burnt out if you're constantly at the edge of your skills, out of your comfort zone.
Regularly look at new arts to motivate you. You can watch youtube art tutorials to stumble on new knowledge that can trigger paradigm shifts in your drawing.
Manifest your jealousy of other artists as hope and motivation (you'll catch up and be even better)
Drawing is a marathon but for only 666 bucks and 80% of your braincell, I can endow you with the eldritch knowledge of waifu drawing.
Edit:
how to draw neat strokes without having to erase stray lines countless times?
If you're doing lineart you don't.
If you're painting you just put brushstrokes on the two sides of the edge to refine it
Technical advice: find the key bind for "trasnsparent color". It turns your current brush into an eraser