Looks like you've altered your cache age to 60 mins, which is super low. That'll be the reason why your cache isn't hitting as often. I'd recommend updating it to 30 days (which is the default) and your hit rate will improve.
If there are areas of your site that you're frequently updating, then I'd recommend installing our wordpress plugin if possible, then setting up the CDN management feature. This will ensure that your content is kept up to date without having to manually clear your cache. You can find a guide on how to do this here: https://support.ezoic.com/kb/article/how-can-i-set-up-the-ezoic-wordpress-plugin-for-cdn-management
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