What I do is draw a lot of doodles where I don't try very hard or spend much time except for the part I'm trying to improve, and I also take note of what I messed up to practice that later.

Other than that I don't know what to say unless you clarify what "skill level" you are or what you want to improve.

excuse your bad drawings by calling them shitposts, then make so many shitposts you start getting really good at 3ds/wii u touch screen drawing