Errors, nothing works anymore..

After a change to the website today our customers keep receiving errors. I’ve reverted everything, cloned the page etc.
Now I cant even add a note to the page that there is an error to warn our customers.
I now have to deactivate our best performing ad campaign since we dont want our customers to see this error without explanation.

I’m sure y’all are working hard but this is the opposite of a reliable product.