Yeah I would agree that for casual conversation Discord overtook for me. I was lurking r/warframe and after losing pc capable running game started gacha and discussed on r/Arknights. So with api fiasco I left Reddit and tried Mastodon... have account and check it out but there is no activity on #arknights , joined discord server for R/Arknights that was made during blackout and still going strong. Like I got better of R/Arknights and not on Reddit. People some use Reddit, some silently, some like me abandoned and even people who never used Reddit joined. Moderating m/Arknights on Kbin but with Kbin dev having unlucky strike and generally hopping he have health to both have normalcy and work on Kbin. So without proper mod tools and some broken features (like webp not displaying, where microblogs from Misskey converts to webp to consolidate space) and some other little wants that I would propose if I knew there would be implemented.
Using Misskey.io before it closed registration to Japanese only (happens when everyone was leaving twitter for Musk dumb thing he implemented). With Misskey at least found artists and players for Arknights but as it is Japanese instance, they only thing I can do is share art so #arknights tag weren't dead on Mastodon.social .
So TL DR left Reddit, joined sub Reddit discord server which is where I spend most of my leisure time, using Mastodon for news, Kbin for moderation (but no one visits, at least no spam as I clean up) and news , Misskey for fan art.