Which should I make a fanfic on?

Hello everyone, I wanted to make a fanfic on this amino, but I don't know what it should be about at all. I have a few ideas in mind but I can't pick one so I'm asking you guys because customers are always right! Please keep in mind that an idea about bakugou and deku may appear. For that I was thinking yandere bakugou x deku. I sorta ship it but at the same time I sorta don't, do you ever get that way? Anyway I'll be quiet and let you make your choice!