Facing a “Site Currently Unavailable” message? Don’t worry—you can fix it....
https://harperscoolthoughts.inkharbory.com/posts/site-currently-unavailable-after-i-updated-wordpress-what-to-do
Facing a “Site Currently Unavailable” message? Don’t worry—you can fix it. First, check your site’s DNS settings to ensure they point correctly. Also, verify folder permissions aren’t causing a 403 error