Read up on your passenger rights! With more than 20mins (projected) delay, your “Zugbindung” ends and you can take any other ICE to your destination. If your delay is more than an hour, you get a 25% refund, if it’s over 2 hours the refund is 50%. If you miss any following trains, need to take a taxi or need to stay in a hotel because of the delay, DB will refund you the cost of that as well. You’re also entitled to a free drink in the train at some point, I don’t know the specifics of that off the top of my head though