I have added my website to cloudflare but it is showing error 521 since yesterday.
Are you still encountering this?
A 521 error happens when Cloudflare is unable to make a TCP connection to your origin server. Review the suggestions in this Community Tip for Quick Fix Ideas.
Still encountering this
I show two zones in your account, one deleted and the other deleted and purged, can you share the name of the domain causing issues?
My Domain: https://iforumbd.store
I removed Cloudfare because it was down