Dynamic IP policies

Hi,

My ISP give me dynamic IP I want to use the policies to bypass when I connect to my selfhost website from home.
Is there a way to use a DDNS service (I have a duckdns domain) or the only way is to edit policies every time I get a new IP ?
If it can give a solution the IP to allow is the same used by the cloudflared tunnel.

Thank you for your help.