Change a group to public but, keep a large amount of git repositories private

Hello,

I’m changing a group that is private to public to be able to have public repositories but, the projects that are private, I want to keep them private. Is there a way that I can do this without making all the projects public then changing each project to private? I had to create another group for public parts but, I’m trying to avoid having two groups with similar names and just one.