Since I've joined lemmy, I've been thinking about some kind of "community merging" feature.
A "meta community" would be able to "follow" other communities across the fediverse and posts from followed communities would show up in the "meta community's" feed. Posts from followed communities would remain on their original instances, or they could be duplicated to the meta community's instance.
There are a lot of details to work out, but I think this would add a lot more usability to lemmy and the fediverse as a whole
Reminds me of the time used a private gitlab repo for a freelance contract where I was working alone. I used it to keep track of tasks in issues. Some issues in this repo really turned into me talking to myself