If you want to refer to a collection of repositories, using a GitHub organization, even if you are the only member, prevents people from assuming you are self agrandizing.
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.
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 :)