Stretch and grow, is what my mom said she used to say to me when I was a little baby trying new things, reaching to touch things etc.
I find that a lot of students get stuck. They do a few paintings using the same style or technique and they are afraid to move to the next level.
Don't be afraid to try a new brush, a new technique of move into some more difficult subject matter. What is the worse that could happen? You find it too challenging and decide to poke that canvas away for another few weeks before trying again.
Stretch and Grow!