Do what Dss0 said. If you need someone to try to join you can add me on Discord Resxt#5079
Basically you join yourself with /connect local IP:port and others join your server by double clicking on it in the server list and for that you need someone outside your network to confirm that he can see and join your server. Note that the server name is the one given by the server key, not in the .bat or the .cfg!