My Cache Miss Rate just jumped to 100%, I noticed that my revenue has also dropped during this time.. How can I rectify this problem?

    I really do not know what else to do there.

    1.) I changed "Override Cache Control Headers" to ON
    2.) I changed "Enable Caching For Cookies" to ON
    3.) I also changed "Default Cache Age (s)" to 7776000

      You need to be using the debug tab to test why the cache is missing so frequently - that's what Mohammad used to find a vary header causing the issue.
      You could then use the setting highlighted in the screenshot below to remove that header from the origin (click edit and add to the list):

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