If your site shows a 'Site Currently Unavailable' message, don’t panic. Start...

https://delta-wiki.win/index.php/Site_Currently_Unavailable_After_Changing_Nameservers:_What_You_Need_to_Know

If your site shows a 'Site Currently Unavailable' message, don’t panic. Start by checking your DNS settings to ensure your domain points correctly. Next, look for permission errors like 403 or authentication issues like 401