Hello,
The following website whatifgaming.com is using the Cloudflare pro package, however, we are continually running into problems.
We have multiple writers from all over the globe and for some writers, the website is unavailable, it shows a 521 error. When I check the website on my end it’s loading and working fine.
A few of my writers have the same problem, it’s mainly from Pakistan and Egypt.
The other issue is that you have an invalid certificate on your server and hence an insecure encryption mode on Cloudflare. You need to fix that too and get a valid certificate.