As for the 500 Internal Server Error you are having on your domain -- once you can access cPanel again make sure that all files have permissions set to 644 or 600, and all directories have permissions set to 755 or 700. Files/directories set to 666 or 777 will cause internal server errors. You can check on and change permissions either in the cPanel file manager or FTP.
your Account was not restored yet after recent updates. I have restored your account. You might need to update the password, as it is a known issue that passwords does not work properly after migrations. to reset your password go to Account Panel.
I'll close this ticket, you can re-open it by clicking "Administrative" if the account is not back in working order.