Maybe this is unpopular but I'm getting tired of opening lemmy and having to scroll past the same post that I have viewed already, half of the posts on the front page are 2 or 3 days old.
There is currently a bug in Lemmy 0.17.4 that causes post rank calculation to stop shortly after the server is restarted. It seems like lemmy.world is affected as well.
I pinged Ruud about this, he can restart the server for now for the ranks to refresh, but I am also working on investigating and fixing the root cause.