Using reverse proxy

hello! I am using an orange pi with a cellular modem(netgear lb1120) and i cant seem to get port forwarding to work. So i am considering using reverse proxy and being that i am relativity new to this, i could not find a step by step guide on how to set it up. Could someone give me a step by step guide or link to get this going? Thank!

This saved my day... https://www.nexmo.com/blog/2019/07/03/ngrok-in-node-red-dr