Adding both authors and genres we don’t ordinarily read is a great way to learn as writers. I found Sunili Govinnage’s article from The Guardian intriguing.

I read only non-white authors for 12 months. What I learned surprised me | Sunili Govinnage | Comment is free | The Guardian
http://www.theguardian.com/commentisfree/2015/feb/20/i-only-read-non-white-authors-for-12-months-what-i-learned-surprised-me

For another list of black authors, check out http://chroniclesofharriet.com/2012/11/01/great-black-authors-of-science-fiction-fantasy/.