The world is certainly not a cookie cutter. Everyone has their own unique set of characteristics and gifts. While I can learn from writers who share my writing style. I can also learn from writers unlike myself. It's these writers that push us out of our comfort zones and give us the courage to try something different, new, unthinkable.
As a writer, you want to expand your audience and give your current readers a fresh perspective...give them something that will raise their eyebrow and cause them to see the world in a different light. You can only do that by incorporating techniques found in other genre's of writing.
One of my favorite writers, Chimamanda Ngozi Adichie, has four published books. Those works include a collection of short stories an historical fiction novel. I am sure she had to study many works of non-fiction in order to complete Half of a Yellow Sun.
And then there's James Patterson. On a recent shopping trip to Barnes and Noble, I stood in awe as I looked around at all the James Patterson books lining the shelves. There were even two or three display tables showcasing his work! Patterson has written thrillers, mysteries, non-fiction and romance books. And now, he's added a fantastic list of children's books (which my children happen to LOVE) to his repertoire.
Take a chance on your writing, folks. Don't be afraid to step outside of your comfort zone. Your readers, old and new, will love it!