website is showing http 500 error

[Oliverromance7]

You should begin by reviewing your logs to determine the nature of the mistake. Begin with /var/log/httpd and the log files contained inside.
Otherwise, run the following command:
ls -art

When you hit refresh in your browser and get the error, list them in date order so you can identify which ones have been updated.

Another option is to preserve the logs stored at /var/log/php-fpm to save the php-fpm.