After change nameservers my site is down

after change nameservers my site is down
Please help me what happened?
thank you

Domain?

prootos.site

thank you for your quickly response

Make sure your encryption mode is Full Strict.

how check this?

https://community.cloudflare.com/search?q=encryption%20mode

its working
wwww
thank you very much
i am intro on this

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