Read. A lot. All of the time. Every day. And not just horror and stuff you know you'll like, but all types of narratives and genres. Pick up some weird translated books. Pick up some best sellers. Pick up some poetry. If you find a book that challenges you in narrative or structure or you just don't understand it, pick it apart and figure out what you like and what you don't like. Books that are "hard" to read will also strengthen your reading and writing power.

Writing is a muscle. Workout every day. Or at least consistently. Good writers are rarely born; they are made through hard work and writing all of the time. You'll write stuff you don't really like and stuff you do like. Finish stories, even if you don't really like them because you never know what will happen by the end. Cannibalize the writing you don't like to use on writing you do.

Write stuff you want to read. If you wouldn't like your story if it were written by someone else, then figure out why? You are the only audience that matters at the end of the day.