Not sure which ports are required for your usage but maybe cloudflared would work? It works on the free tier as well, you can install cloudflared on your linux/windows server (no BSD support afaik).

Freenom’s domains are pretty unstable, they lost management for .ga domains last year and they often claim others’ free domain when they have high usage.

though if you have unstable network I won’t suggest self hosting fediverse stuff.

Check https://whatismyipaddress.com/ to see your IP address once you’re connected to either network, but with a high likelihood, it’s almost certainly different IPs. In that case, Dynamic DNS is probably best.

But if you’re using your neighbor’s wifi, I doubt there’s a way for you to host stuff unless you have access to their routers, can open ports 80 (HTTP) and 443 (HTTPS), and forward them to your server. It’s best to use hardware you control (including the router).

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I don’t do anything special, I just have a really stupid domain name that no one else would want. I don’t use autopay so maybe that helps.