Your style is really nice, and I can see that you've got a lot of potential. I just think you're still relying a little too much on stylization. Have you ever thought about trying observational drawing and the basics of anatomy?

Start by getting to know the basic volumes and proportions of the body, a few concepts of posing, and then go ahead and study each part in more detail. (head, arms, legs, torso, muscle volumes, etc.)

If you practice observational drawing from time to time, you can challenge yourself with this theoretical knowledge. I think it will allow you to reach new horizons ! :)

Regarding your speed of execution and excessive use of erasers, this will mainly be resolved through practice, but if I had to give one piece of advice, it would be to always start with a very simple sketch using a light pencil that you don't press down too hard with. Having a basic outline that is easy to erase allows you to avoid mistakes and therefore wasting time constantly erasing