Seeing a “Site Currently Unavailable” message can be stressful, but you can fix...

https://andysexpertblog.nexorafield.com/posts/site-currently-unavailable-after-changing-file-permissions-what-you-need-to-know

Seeing a “Site Currently Unavailable” message can be stressful, but you can fix it step-by-step. Start by checking your DNS settings for any recent changes. Confirm your permissions aren’t blocking access, like a 403 error