It actually does work, there is no 521 error → sitemeer.com/#rohitchauhan.in
If there was, you’d simply need to make sure that your server is reachable. That wouldnt be a Cloudflare related issue, but solely something you or your host need to look into.
Though, it only shows a generic spam landing page right now. Does the IP address you configured end in 91? If so, you most likely configured the wrong IP address and need to clarify this with your host.