Mac mini delete-How can I recover it from my iPhone

Not sure what happened, or where this is going, or what got deleted in what app.

Are you asking how to use the same Apple Account everywhere?

Or asking how to re-enable Find My for another Apple Account?

Or how to (re)enable Family Sharing to get some sharing capabilities across Apple Accounts?

Or probably less likely, how to re-enable remote file server access on iPhone, when connected to the Mac mini?