You have to erase the phone and start all over again. You can erase the phone in Settings>General>Transfer or reset iPhone>Erase all content and settings. Then pick one of those three methods to transfer your data again.
Transfer data from your previous iOS or iPadOS device to your new iPhone, iPad, or iPod touch - Apple Support
If you cannot erase the new phone because it is stuck on the transfer, try restarting the phone and then erase it. If it will not restart the conventional way, try a forced restart.
Force restart iPhone - Apple Support