Site crashed when upgrading to PHP 8.3

Hello,

I recently upgraded the PHP version to 8.3 (from 7.4) and I received the “fatal error” message. I copied the message in the private content. In fact I was not able to log in to my WordPress dashboad. I also tried to restore my site but that didn’t work and made it worse—site completely crashed. I had to revert back to PHP 7.4 to get the site back up and running. I’m currently using Enfold Child theme 7.1.1. and WordPress 6.8.2. After reading several threads, I assumed that the Enfold theme was compatible with 8.3. But that doesn’t seem to be the case.

I contacted my hosting provider and they said the theme was not compatible with PHP 8.3. Please advise what to do. I need to upgrade the PHP version so I get the security updates. I haven’t tried upgrading to 8.2 or 8.1.