Decentralization and ditching GitHub is great and all, but not every individual FOSS project should have their own giant stack of SSO, Zulip, custom external issue tracker, Gerrit and external wiki in addition to a self hosted Forgejo...
especially when there's like <5 regular contributors!
It shouldn't be this complex and confusing to contribute to a project for no reason. And I'm not buying that a non-huge project has an actual, real reason.
If you, dear reader are thinking about overengineering your own project's development stack like this, please be aware that you will be driving external contributors away, and consider if that aligns with your goals.