There is no a one for all alternative to Reddit. There are few promising tech as Lemmy or Kbin because they work with ActivityPub as Mastodon. What I have seen many don't like the free speech nature of ActivityPub and run away if they see a tech with an instance not of their liking.

But Reddit tipping point started because most of 3rd party clients are closing as Apollo, none of current alternatives have a good client as Reddit clients.

There are few centralized alternatives you can look up as Tildes, Lobsters and stacker news (focused on Bitcoin and Nostr).