Most people aren’t even thinking of moving to reddit alternatives. Users have a lot of power in this situation. Just move your community to Lemmy or Kbin. It’s not that hard.
Also historic threads that probably will never be feasible to create anymore. Eg, I loved to read TV show episode discussions right after I watched the episode. That includes for older shows. As long as it didn’t predate reddit, basically every notable show had a decent sized thread for every single episode. But a lot of those were only able to take off because they were created when the episode aired. Rewatches don’t get the same kinda discussion.