I hate to say it, but stability concerns aside, one thing that's keeping users off of the #fediverse is the lack of a algorithmic feed.

#BlueSky is trying to implement this, but their implementation sucks. It doesn't work (see attached).

Most fediverse instances already have the concept of multiple timelines (following, global/federated, etc.). It wouldn't be that difficult to add additional ones that are algorithmically ranked based on engagement.