You are using lemmy.today, which as 12 monthly users based on https://lemmy.fediverse.observer/list (the 1m column)

I would suggest trying out lemm.ee, sh.itjust.works (both more that 2k users), sopuli.xyz, reddthat.com (600 users). The previous link is usually a good way to find an instance that is populated, but not too much (the obvious bad choice being Lemmy.world)