I can't use :3000 port

Hi;

I used domain.com:3000 port for Node.js before using cloudflare. But now i move my nameservers to cloudflare, domain.com:3000 port not working.

What will i do for use node.js or use ports.

Yes, Cloudflare does not support that port. Either change to a supported one or unproxy. Use the search for more details.