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

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.