Site not loading after upgrade Lightsail instance

Site not loading after upgrade Lightsail instance
getting 521 error. but is accessible via IP but not accessible through url

Regarding Cloudflare 521 error, may I suggest you to take a look into below article to troubleshoot the issue, therefore if you already did may I ask what have tried so far from the suggestions below?: :thinking:

Maybe something at the Lightsail firewall changed or need to be fixed?
For example, kindly re-check if Cloudflare is allowed to connect to your origin host to as follows in the below article:

Nevertheless, Cloudflare IP addresses list can be found here:

Before moving to Cloudflare, was your Website working over HTTPS connection?

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