Impossible.
I've done a couple chapters, but I gradually lose interest as I go on, I can't remember if I have ever finished a genre that wasn't BL, or fluffy fanfiction.
I've tried doing a naruto fanfiction on Wattpad, and it's still popular to random readers, but I don't think I'll ever continue because fight scenes are just not my thing.
I'm terrified of horror so I can't write about that either.