Python based game which is working on LAN, how to make it accessible via Internet?

Hello,

I've made a multi-player python based game using sockets and thread. It is working well over LAN. I would like to know what should be done to make it work over internet such that one of the player is the server and the remaining are clients. The clients can connect to the server by providing the public IP address of the server. (It is given that, the player(server) who started the game communicates his public IP address to remaining players (clients) by SMS/Mail/WhatsApp etc). Following are the other details:

• Python 3.8
• Windows 10 OS
• Used PyQt5 for GUI

Thanks for reading through, and providing any help if possible. Thanks a lot for your time.