Seeing a "Site Currently Unavailable" message can be frustrating, but you can...

https://wiki-club.win/index.php/Site_Currently_Unavailable_After_Uploading_a_New_Theme:_What_to_Do_Next

Seeing a "Site Currently Unavailable" message can be frustrating, but you can fix it quickly. Start by checking your site’s permissions or authentication settings to rule out access issues