How do I unblock a website?
A website I visit regularly is now blocked by Safari. How do I unblock it?
MacBook Pro 13″, macOS 12.7
Safari->Settings->Privacy->Manage Website Data->Remove all->test.
If that doesn't fix things then it’s possible that the website in question has been placed on the Apple/Google insecure list as being dangerous.
You don't mention the website but it would be up to the webmaster of that website to get it off the list.
You could also try using a different browser like Firefox, Edge, Chrome, Brave, etc. If it’s blocked in those browsers then the site is definitely wonky enough to be blocked.