You probably need to progress through other's story like Rutherfurd and Harold perhaps?
oh I didn't realize I needed Harold's, I believe I've got most stuff done for Rutherford tho. thank you!
There's a fanmade wiki that might be able to help as well. But more than likely, just play around with people you haven't before, or you're missing a good chunk of content for and it'll more than likely unlock others.
