Forgejo is Gitea. It was a soft fork of Gitea, and more recently a hard fork.
You can read about why they hard forked, and decide for yourself if it’s worth switching, but the consensus is that Forgejo is in better hands than Gitea.
Currently it’s easy to migrate from Gitea to Forgejo, but the longer you wait and the more it diverges from Gitea, the harder it will become to migrate.
If you like the Forgejo direction and think it’s in better hands than Gitea, you might want to consider migrating sooner rather than later. All of your data should remain intact as it’s essentially a drop in replacement. This should only take you a few minutes if you’re using the Docker version of Gitea.