Aww. That kinda sucks. When I started RPing rated content weren't really popular. If it becomes too much of a problem, may try gathering like-minded players who also encounter this issue. At least that nabs you a small group you can frequent if things go well.
Not a particular fandom, but I'd want to practice playing more villainous characters. Chainsawman or Tokyo Ghoul come to mind. Not with the exact power sets but definitely their way of thinking.