Issue with remote connection

I have had a stable setup for months, remote connection via DuckDNS. However yesterday it suddenly stopped working, I found out that the IP Address had changed.

I can now access HA again, but only locally, the remote access does not work. I updated to the new IP on duckdns but still it does not work. Am I missing any step?

As you may notice, I am not an expert in networking, but I do now realise I need to setup a static IP.

Edit: when I ping my duckdns url, I get a response in cmd.