I'm running board version 3.3.9 and php version 7.4.33.
We received a cPanel notification this morning saying:
New Security Advisor notifications with High importance
PHP 7.4 reached EOL
We strongly recommend that you use a version that is still supported upstream.
If you do continue to use it, you will be susceptible to any remaining bugs or security issues.
We recommend that you use the MultiPHP Manager interface to upgrade your domains to a supported version. Then, uninstall this version in the EasyApache 4 interface. For more information, read PHP EOL Documentation.
When we change our php version to 8.0 and navigate to our homepage we get an error message saying: This page isnt working. HTTP error 500.
If we change our php version to 8.1 we get the error:
SQL ERROR [ mysqli ]
mysqli_connect function does not exist, is mysqli extension installed? 
An sql error occurred while fetching this page. Please contact an administrator if this problem persists.
Any advice would be appreciated.