1. Do you want something that works and feels like GitHub? -- Forgejo and Gitea are good for this.
2. Do you want a place to host git repositories with minimal hassle? -- GitLab, CodeBerg, and others are available.
3. Do you have your own hosting infrastructure? You could use gitolite and CGit/GitWeb on that hosting platform or local hardware.
4. Do you just want to host repositories? -- Gitolite can be used to help with SSH/auth/repository creation, and CGit or GitWeb for the frontend.
5. Do you need something like GitHub Actions? -- GitLab, Forgejo, and Gitea offer CI, or use external CI infrastructure.
6. Do you need issue tracking and management? -- GitLab, Forgejo, and Gitea provide these. There are alternatives from Jira to Kanban (including Trello) to Markdown (Obsidian and others) and more.