Go to some quilt shows ... see what attracts you to certain quilts. I know attending a few national shows really shoved me into be more adventuresome with colors... that was the one thing I walked away from every show ... the colors were just so fabulous. So every time I found myself navigating back to my comfort zone... I had to make a very conscience effort to go against my norm.
If you examine what captures you about a certain quilt(s) you will know what you want to work on to improve.