RPI CF SSH + Port Forwarding / mapping

so I have an RPI set up as a VPN and SFTP, and cloudflare DNS managed to make my janky solution work for exactly 2 hours, i came back everything was messed up, I couldn't connect through the domain, I could not use the VPN, I could not really access the subdomain at all, I can only access it through the public IPv4, and I'm not sure what to do. My ISP's router has a completely static IP, I have DHCP reservation on for the RPI, I assigned the required ports in port forwarding settings and everything, everything is refusing to work through the domain name, what am I supposed to do now?