Does a new subdomain will solve the reinstall problem?

I've reinstalled lemmy several times and after I went public with my instance, I figured out federation is broken for those posts with a low id, because those posts got federated and after reinstall, they have been ghost data and no sync happened.

Now, I've figured out that almost every post is broken and doesn't federate correctly. It shows the wrong posts on different mastodon instances.

Will a new installation, BUT with a new subdomain solve the problem?

If yes, will it be possible to move all posts to the new installation without breaking anything or do I have to rewrite every post?

I've created a question about the moving posts on Github, too.