HTTP 500 Error to my site. I need cpanel to resolve it

My site : https://publicdiary.ga , when loaded says "This page isn’t working. Http 500 error. As per the solution in internet, I need help of cpanel. So, either provide me my cpanel link or solve my website error problem.

Cloudflare does not use cPanel. But you can Pause Cloudflare for your site from the Cloudflare dashboard’s Overview tab. The Pause option is in the lower right hand corner when you scroll all the way down.