I miss r/worldjerking. To me, it was one of the funniest niche subs on reddit.

yoyo and riddim dubstep

conlangs and neography

A few subreddits I were in were from Hetzner Online (r/hetzner) and Google Workspace (r/gsuite) which I did not find an equivalent for yet. r/armbian and r/armbianusers were mostly secondary since there was/is no interest in moderating those from the official project side. However was reading there from time to time.

Swords and legorockets

/r/scalemodel

Teaching, teachers, TESOL, international teaching. Basically just a support group for struggling teachers.

Communities You Check Out. Some the old subs on community/magazine style.

I think the link didn't work. Here it is https://lemmy.world/post/983150

r/hockeyplayers
r/hockeyjerseys
r/Canes
r/nin
r/weimaraner
r/pearljam

I'm missing a few, but those are the first that came to mind

jailbreak, PS4deals/PS5deals

AITC and legslcatadvice

r/visiblemending r/fromscratch r/vermiculture r/TwoXChromosomes

r/latinopeopletwitter

I miss the sporting communities on subs like r/nrl where there would be thousands of posts on each game thread.

r/RomanceBooks There's not really a replacement for it that I've found on Lemmy yet