Maybe check how long it is already going, so it can give you some confidence. Forgejo is a fork of gitea, which is a fork of gogs.

Also, codeberg, a nonprofit from Germany, is supporting development.

https://docs.codeberg.org/getting-started/what-is-codeberg/

The codebase history of Forgejo and its predecessors predates Codeberg. However, since 2022, Codeberg is backing the development of Forgejo as an umbrella organization.