Several errors halt the operation of the WordPress website, and WordPress error 500 is one of them. The intimidating about internal server error is that it doesnt give a specific reason for the error. But as we know, it is also easy to fix WordPress error 500. You can try following solution tips to eliminate error from your website
There might be a memory issue on the website. Kindly go through the wp-config.php file and raise the memory. You can raise the memory by replacing the default 64M into the 25M. the new code will be define ('WP_MEMORY_LIMIT', '256M');
Delete all plugins and then reactivate them one by one to detect the faulty one
