I must sample their handles for videogame character names.
Bit like asking where all the beer drinkers are! People who are into psychedelics come from all walks of life and we're everywhere :) Start talking about fringe stuff with people and eventually you'll stumble upon others.
If your bubble has people in it who have access to psychedelics, then great. If one's people doesn't have that, "just talk to people" is profoundly unhelpful. That's a very odd and specific conversation to bring up within some circles.