If I turn this feature on, my CPU is normal, if I turn it off, the CPU is 100% and the website is slow.
Number of visitors is 200
But Googlebot will be blocked, causing my website not to display
I found this article
Can you check in your server logs which IP address these requests are coming from? Some Cloudflare features like Automatic Signed Exchanges (SXGs) might cause heavy load on your origin, and the IP would not be a Google IP in that case.
You might want to look into deploying some sort of local cache on your server. With such a low amount of traffic, Cloudflare cache isn’t really going to be of much use to you.