I started out strictly making pyramid bows for about 3-4yrs. Then I transitioned into parallel to mid limb then tapered to the tips. Did pretty good with those. I started going shorter so that necessitated this new kick I'm on, D/R sort of with something similar to the pyramid and parallel cross breed in that it mildly side tapers for half the limb, much more of a pronounced taper to about 5-6" and then as narrow from there out as I can get it without losing stability.
It's is all about progressing at your pace at what pleases and interests you. I have taken things I liked from previous bows and blended them into the next. The stave will dictate how much lee way you have as well. Like someone said before, maybe try working with staves that are outside your norm. Ones that can't be made the way you normally do.
I'm not one that really believes in "evolution" of species per se, but I do believe in evolution of thought and in the case of bows, evolving as a bowyer as your experience grows.
Hang in there buddy just keep walking the path.