I need help for my public paper server with port forwarding

Hey Guys! I want to create a paper server for me and a few friends. I want to host it on my raspberry pi. I am running Ubuntu 20.04 Lts on it. I forwarded the port but it did not work. My router is the alcatel Linkhub HH40v.
I need help because i will be finished when the 1.17 release.