I haven’t been a moderator for any community on Lemmy, so I don’t know if this feature already exists or not, but I think it would be very useful for moderators to be able merge communities. Users from the old communities should be automatically subscribed to the newly merged one, while the old communities gets removed.

This requires some way for mods to send merge request to mods in other communities, and for those mods to accept that request if they want to.

Every unique post should of course remain unchanged in the new merged community, with all its votes and comments intact. Duplicate posts however should always get merged if they belong to the same user, meaning that now the merged post will likely have more comments and votes than any of the posts it was merged from.

There should also be an option for mods to move a community to a different server.

With this, we can make Lemmy much easier to navigate for it’s users by merging multiple similar communities while also increasing the activity in those merged communities since they will now have more users.

Since Lemmy is still growing, a lot of the infrastructure isn’t in place yet. This means communities will exist on servers available at the time of their creation rather than the more suitable server for that community that might show up in the future. Ability to migrate communities (and users) from one server to another is essential for Lemmy to stay decentralised.