I'd say both have declined, but probably for unrelated reasons.  In terms of bitcoin folks- there are just way more people now, and the reasons for newbies toi be interested in bitcoin are different as well. The conversation becomes less nuanced and interesting. "woohoo lets all get rich" is a fun meme, I get it. 

eg, r/Bitcoin is more or less an unironic wallstreetbets now lol 

 Hmm I guess I miss connecting with more bitcoin folks, and the interactions on other platforms have declined in quality over the years. nostr seems more of what I'm looking for, I just haven't had as much time for it as of late.