kivia Good morning, Heather here I hope that you are well. This article explains more about how to get an optimal cache hit rate https://support.ezoic.com/kb/article/how-to-improve-my-cache-hit-rate
At the moment you have changed the maximum cache age to 30 minutes, this means that every 30 minutes Ezoic is going to your host and requesting a fresh copy of your site. We would recommend removing this restriction and setting up the Ezoic CDN manager ttps://support.ezoic.com/kb/article/how-can-i-set-up-the-ezoic-wordpress-plugin-for-cdn-management so that every time your site updates the smallest part of content the Ezoic CDN will clear the cache for that part only.
For the minimum, cache age 300 seconds is fine. many thanks