Hello I see you guys want more roles for the sequel. I suggest to do a little research for games like werewolf or mafia that have a similar game mechanics of traitors vs innocents, it could help you with some ideas!
Thing is what attracts new players to among us is it's simplicity, things like Town of Salem and all are way too complex and convoluted for new people to really feel like putting the effort into learning it, hence why they aren't as popular.