My website often has 520 errors, how to solve it

http://www.quanmingpaidui.com/ My website often has 520 errors, how to solve it
Ray ID: 655d6c63aead95ed

May I ask if you have checked the suggestions from below articles?:

Is Cloudflare allowed to connect to your host origin/server?

Cloudflare IP list can be found here:

I see your Website cannot be loaded over HTTPS (secure connection).
I also got some strange redirection in between and resources not being loaded correctly.

Furthermore, as far as I have checked, your domain is not using Cloudflare.

QUESTION
quanmingpaidui.com. IN NS
ANSWER
quanmingpaidui.com. 21599 IN NS forecast.dnspod.net.
quanmingpaidui.com. 21599 IN NS zipper.dnspod.net.

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