@JRFreeman @GossiTheDog the content is still there, the servers probably weren't hosted in Afghanistan.
It's as simple as purchasing a new domain name, updating your certs, changing some server settings (to reference the new domain in generated links) and sending an email to your users with the new domain in it.
Like, this is actually one of those things in IT that doesn't have a lot of hidden complexity: the process I described is the _whole process_.