So, the site is currently in read-only mode - you can still view all the films just as before, but no new films can be submitted at the moment, and nobody can access their accounts.
I'll update this post when that changes.
UPDATE 2021-07-19: Login & registration is now working again, but there are some bugs with adding/editing content. Working on it...
UPDATE 2021-07-27: Everything should be okay now.
I'll try to make the next hosting change (if one happens) more seamless than this one. I made some mistakes because it's my first time changing hosts in a long time.