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I wrote a script that runs periodically on my home server to update DNS (Cloudflare) if my IP changes. In practice, it almost never changes and my ISP's general flakiness is far more of a problem.

I used to use a chronjob + script that queried my external IP and then if it is different from the dns record make an API call to my dns hoster (name.com at the time). For a homelab, run it every 5 or 10 minutes and you'll always have an up to date record that you manage.

I just run a dynamic dns client on OpenWRT. I’ve never had an issue reaching the joke server.

I got an Asus router & installed Merlin. Comes with a Wireguard server & Dyndns support built in, all via a very simple user friendly UI.

if you own a domain you can likely update a dynamic DNS record through the registrar's API

e.g. my cheap hosting on cPanel lets me do this through a simple HTTP req

https://docs.cpanel.net/cpanel/domains/dynamic-dns/

My ISR only supports DynDNS and NOIP, so I just curl this URL every day.