Hello, I have been encountering such a problem for 2 weeks, but I could not find a solution. Does anyone know why I am experiencing this problem? I’m new to this and I don’t know much.
Welcome @vdF Happy you are here
Your domain points to google dns
ns-cloud-a1.googledomains.com
ns-cloud-a2.googledomains.com
ns-cloud-a3.googledomains.com
ns-cloud-a4.googledomains.com
You need to setup your DNS and create private nameservers.
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First of all, thank you for your answer, but I have no knowledge about these issues, I had already set up a site and got the DNS addresses via cloudflare, it gave this error within 2 months, I could not understand why, is there a video for me, maybe I can fix my site while watching the video 
Did you migrate your website from squarespace ?