Honestly here’s my best advice, find something popular in your fandom to write about and find a really cool unique concept, it sounds cliche as hell but make sure you actually enjoy what you are writing about because otherwise you are never gonna finish the fic and it will just stay shelved. Marvel was a fandom i was in when i started Right Universe and Peter Parker was both really popular and a character i really liked so i wrote about him! a final thing is make sure to use tags, it’s the best way to get to ur story out there and if you are updating it frequently it’s also likely to appear to a lot more people!