I'm sure I've told this story before on this board but it's applicable in this case. I was fortunate as a young quilter to take a course in sewing technique from a woman who ran her own custom tailoring business in San Francisco in the fifties and sixties. This woman knew all the custom clothing construction techniques that are used in the high fashion couture houses. I learned beading, needle turn applique, French draping, fitting, and every sewing technique you've heard of and probably some you haven't.
On the last day of this year long course she said to us, "Now that you know all the rules, go out and break them!"
The more you know how to do the more you can do. Because of my training I'm not afraid to tackle anything and I joyously break the rules. Technique is a tool. Creativity is using tools to explore the world outside the box. I purposely seek out the "impossible" because I feel confident enough to give it a good shot. I love learning something new because I get too bored with projects that don't challenge me.
There are a lot of quilters out there that are limited in their creativity because they get too caught up in how things should be done because they took a class or read a book. If there was one thing that my 40+ years of quilting has taught me is to do my own thing always.
If you're feeling like you've lost your creative mojo the best way I know to break out of it is to take a break. Challenge yourself in a different way. You'd be amazed at what you'll learn about yourself and your art.