Typically you can’t port forward a cellular connection. So you’re kinda stuck. We used to offer a proxy service for cellular users but I think that went away. There are instructions on out wiki to build your own proxy server which is a complex undertaking.
Another solution is to use an RTCM which connects to you node at home or (better) in the cloud. If interested I can explain in detail.
Or maybe someone will jump in here with another solution.