Revenue? There are no paid for products or services on WordPress.org, so I'm not sure what revenue you mean. No one here is going to fix your site for you for free.
If a plugin update caused the issue, the new version of the plugin may not be playing nice with another plugin or there may be some other cause. To troubleshoot this you can deactivate all plugins by resetting the plugins folder.
To reset your plugins folder via FTP or the file manager provided in your host's control panel:
Via FTP or your host's file manager, navigate to the wp-contents folder (directory)
Via FTP or your host's file manager, rename the folder "plugins" to "plugins.hold"
Login to your WordPress administration menus (/wp-admin)
Via FTP or your host's file manager, rename "plugins.hold" back to "plugins"
If this is successful and the site comes back up (as it hopefully should) you can identify the errant plugin by reactivating the plugins one by one until it breaks again noting which plugin was just activated.
Then if you believe a particular plugin has caused the issue, look at the WordPress.org forum for that plugin and if no relevant answer is already there, post details of the issue providing as much relevant information as possible.