How did you do that? Did you set the DNS records from to or did you change the nameservers back?
Clear your DNS and browser chache. How ever: When a server behind Cloudflare doesn’t respond die whatever the reason is, you’d see a Cloudflare branded error page, not just a ‘connection refused’
So after a long conversation with bluehost, it turns out that their Cloudflare integration from their own site doesn’t work properly and it also injects code into the apache config file which breaks the apache server.
Their recommendation is to activate Cloudflare from Cloudflare not using bluehosts service.