I mean that an organization would be a lot better than what you are doing now.

Alternatively, a "central" repo linking to the others would also work.

Right now, the site says that the link leads to the project, but instead, it links to you. That's giving the impression that the project's primary goal is to raise your personal profile.

FWIW that thought (of self-promotion) didn't even cross my mind when I clicked the Github link. All the git repos on your root page are related to that project, and looking at the git history it's not a "community driven" project.

Maybe start thinking about creating an organization when there are other maintainers with push- and merge-rights, but until then keeping the subprojects under your user is completely fine.

Also: your project, your rules - just do what feels right to you :)