How to rerun the setup assistant

I deleted previous backups from the Cloud from previous iPhones because it said Inwas out of free space to backup. Now that I have the space theonly way I can turn cloud backups on again is to run the setup assistant. Well the assistant only will run when you upgrade or program a new phone which neither apply to me. Doe anyone know how I can run the assistant manually or otherwise so I can turn the cloud backups back on please?