Too many repositories
Here is the main problem: too many repositories.
The problem is once you have many repositories, GitHub doesn't tidy anything, you will soon get a random list of all your projects with absolutely no link between them.
To me the solution was to create organizations and to appear as public member on each of them to make them visible on my main profile. I hope there will be an easier way a day to tidy GitHub, but as far as we are now I don't know any alternative to organizations. That's not perfect, but that do the job.