If anyone needs help with port forwarding, I've made (quite a while ago) a script that makes a public server without port forwarding. It works with most routers over WiFi (and possibly Ethernet), and I'm open to suggestions.

I posted the script on a Minecraft Workshop sub-forum on this site, but it is probably best to post it here to for those who need help with port forwarding. On the thread there's a brief explanation of how it works if you'd like to know.

This is the thread with the download for the script
If you need any help or have issues with the script, either post in that thread or this one.

Also the script was originally designed mainly for Bukkit, but it also supported Vanilla. Now it supports Bukkit (if you still have it), Spigot and the official server software.