Unfortunately, it's rare that "my" OTPs, or even my favorite character, is a fandom favorite, so often there's just simply not that many stories out there I want to read.
Also--and this might be an unpopular opinion--while I don't mind slash, it has to be a) reasonably tasteful (no outright smut for me) and b) between characters that are already a couple or are not in committed relationships with other characters or make sense to me. Which is why I loved the Hawaii 5-0 reboot but didn't read a ton of H50 fanfic: I'm simply not into Steve/Danny, which is what I swear 90% of the stories are centered on.