Get better at making art by making more art. The pottery class experiment is pretty famous and corresponds with what some artists experience:

http://www.lifeclever.com/what-50-pounds-of-clay-can-teach-y...

One thing to be careful about is your personal success as an artist through craft and commercial success as an artist. Commercial success requires reaching people with relevant material that engages them and is another level of skill above and beyond being able to make visions real.