We were able to find your host in one of the previous topics and connect to FTP. We found that your issue was related to PHP Memory limit https://prnt.sc/qscotd not to PHP version. We added define(‘WP_MEMORY_LIMIT’, ‘256M’); to your wp-config.php and customizer works fine http://prntscr.com/qscwhb
You have a lot of third-party plugins, every additional plugin uses your memory, so I would recommend you to check the active plugins list and disable plugins that you do not really use.
