Best-Ai Data backups performed every 24 hours are located in the backups directory. You can copy selected data from this directory via SSH. If you do not have any valuable data to restore, or if you only removed the website from the panel without deleting the data, simply create the website again in the panel.
The hosting account login (and, if referring to a subdomain in the serv00.net domain, its component as well) can only be changed by deleting the current account and creating a new one.