I think if you’re looking for tons of replies, the fediverse isn’t going to be it - not untll the mainstream sites become so toxic that users bolt in droves.
You'll start to hate Lemmy too if / when the great unwashed masses begin showing up. Those of us who've been around, shout to @kmirl@lemmy.world, have watched this play out over and over again.
When the norms start congregating in a single place you can be assured that place is going to shit.