While Cache Everything with Edge Cache TTL is very fast it will almost certainly break the functionality of your Wordpress site without the Bypass on Cookie option offered by the Business Level of Cloudflare.
But the good news is that you can get very close to the same performance with a very few other tweaks for a lot less money.
Enable Argo. For a small site we are talking $5 to $10 a month and it will reduce latency by about a third. Don’t worry about Argo Tunnel, just sign up and turn the button to on.
Use a Caching Plugin. I like WPRocket but Wp3 will work too.
You definitely should also use an Optimization plugin like Imagify.
When using Imagify make sure to enable WebP images and to also enable WebP caching in WPRocket. WebP is image optimization developed by Google. This should improve your GT metrix scores.
Ok you can’t Cache Everything for your entire site. So what. Most of the load on a typical site is in your images.
So create the Following page rule:
Browser Cache (1 day) Caching (Cache Everything) Edge TTL (1 month).
There are no cookies to worry about with this Page Rule. Everything should work just a lot faster.