Users are advised to manage their account usage by either upgrading their plan or adjusting their current usage to fit their existing plan, which may involve making private repositories public, deleting large repositories, or requesting others to delete forks of their private repositories. For assistance, they can contact support through email or join the #github channel on Freenode, and the Google group is also recommended as a helpful resource. The message conveys a sense of community support and acknowledges a successful first week.