This tool lets you migrate your own posts from any subreddit to any Lemmy community you want, I made it because I couldn’t find anything else that did it the way I wanted to. I’m super happy how it turned out, I managed to get 9 years worth of posts over this way…
The GitHub link shows how to use it in case you want to!
I want to be a good citizen here so if there’s anything else I can help with let me know