How to remove custom domain from all projects?

I recently tried custom domain for github pages. Now I am not able to remove domain from the projects. The old domain is not available to me anymore. I need help on how to get back to https://myuser.github.io

Delete the CNAME file from the repository to revert back.

There are no CNAME files. All the repository github pages are redirected to another domain. Instead I tried to create an empty CNAME file. but that didn’t work either.

Your paxprz.github.io repository still has a CNAME file, delete it and things will revert back.