How to restore my web?

Hmm, you’re right.
Do you have Display Errors set to on, or WP_DEBUG set to true? If so, I’d recommend disabling them and trying again.

The following is a quote from an article that describes how to enable these settings, but I altered it to show instructions on how to disable them:

Alternatively, the login page in seems to work, so you could try that. Can’t know if any of the deprecation warnings will prevent any redirects and cause any further issues, though.