Best way to change IP and to have it 100% working on almost all new routers and modems is to just turn it off and unplug everything for 6 hours.
I wouldn't even recommend hacking sites with a simple dynamic IP change. And even if you were to use a Proxy its still traceable. They can get your MAC IP.
Your best to use a VPN and then access a PROXY. And also make sure you have a safe MAC IP Spoofer.