I used to run an rpf exchange and sometimes I think about restarting it but I don't know that there's really an audience. I definitely don't have the energy.

Newer ideas, space or sci fi themed bingo cards! And a [specific niche-ish kink] themed exchange.

There is a female relationships exchange, but you don't match on relationship type so you have to be comfortable leaving that part to optional details. There's also the gen exchange, maybe?