I would honestly not want to ever get targeted for a ddos attack on my home network ip. It's 5 bucks to buy a stresser online. Maybe you can even find one for free. People used to do that for fun when skype was around since you could resolve people's IP addresses due to a bug in skype. The worst possible outcome is they disconnect your network or block your port forwarding privileges outside of your own network being down for your family. I wouldn't wish ISP support on anyone, much less ISP support that would rather just terminate you than help you protect your homelab server.