Hello,
When you see the blank screen when trying to edit products after enabling of the cache plugin is not the plugin issue, it’s related to WP memory, it’s not enough because you are using 55 active plugins. It’s too much and you get the memory error. Please, check the list of the enabled plugins and disable those plugins that you don’t use at this moment. Also, you need to keep in mind that every plugin that you have enabled slows down your site a little bit, so only the really necessary plugins should be enabled.
To speed up the site we need to change the image settings and regenerate thumbnails to apply these changes but once we installed default plugin recommended by WooCommerce – Regenerate thumbnails – we got the fatal error, so, please, provide us FTP access to remove the fatal error.
Regards