Since WordPress 5.2 there is a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email.
In this case, WordPress caught an error with one of your plugins, GP Premium.
An error of type E_PARSE was caused in line 512 of the file /home/jandngal/public_html/wp-content/plugins/gp-premium/elements/class-hero.php. Error message: syntax error, unexpected ”site_’ (T_ENCAPSED_AND_WHITESPACE), expecting ‘]’
do you have any Header Elements on your site? As that error points to an issue with the content of one of them. You check by Quick editing each one and changing there Status to Draft. If the error goes away, re-enable one at a time to see which one is at fault.