"Write What You Know" is the tritest advice ever exhorted in conventional creative writing classes. How boring. How restrictive. How cruel. How utterly ridiculous. It's a surefire way to reinforce the cultural status quo. It traps us in an ouroboros of classic and popular fiction built to exclude Other. It limits scope and imagination. It sets up failure at conception.
Gah.Don't write what you know. Write what interests you. Write that which provokes your curiosity and pushes your boundaries of comfort and knowledge. Get into the minds of people you're not, understand their desires and their conflicts. Expand your empathy by creating circumstances in which you would never find yourself. Explore environments that are the antithesis of yours. Challenge the concepts of normal and acceptable. Grow as a writer and you grow as an individual.
Feed your weird.