WordPress/cPanel/LiteSpeed expert needed for PHP upgrade and HTTP 500 fix.

I need an experienced WordPress developer to troubleshoot a staging-site HTTP 500 issue involving JPG/PNG files being incorrectly handled by PHP, then safely update the site to a current supported PHP version along with WordPress, Avada, and plugins. The work should include identifying the cause of the staging issue, checking LiteSpeed/LSAPI, PHP handlers, MIME settings, and inherited configuration, then confirming that the site, theme, and plugins are compatible with the newer PHP version before changing the live site. The developer should first make the staging site stable, update PHP and the WordPress stack there, test thoroughly, and only then make the corresponding changes to the live site after a full backup.