Website not found or accessible

My website was fully developed and functional but ever since i connected it to Cloudflare using its nameservers , this is what i get .

Not Found

The resource requested could not be found on this server!
I contacted my hosting and they said the code show the website is online but has no content, yet my website is fully developed and functional. I was accessing it well because changing the nameserver to Cloudflare ones. So what can i do , I have waited for more than 48 hours thinking that its DNS propagation but i don’t know what’s going on. Does connecting to Cloudflare comes with all this downtime or there is a problem

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