I'm here a month now, from Reddit - got banned there after 14 years, and honestly, find it far nicer and more peaceful than the hot mess Reddit has become since the IPO.
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. When I think of how nice reddit was at the start, and how sparse some subs were.. it just takes time for the user base to reach a critical mass.
Patience, grasshopper.