Quick start needs to finish

if Quick Start was interrupted during the setup process, you can restart it. To do so:

1. Restart the Quick Start process:
   1. Ensure both devices are near each other and connected to Wi-Fi.
   2. On your new device, restart the setup process by turning it on and following the on-screen prompts to use Quick Start again.
   3. You may be asked to bring your old device near the new one to continue the transfer process.
2. This may help --> 3 Ways to transfer data from an old iPhone to a New iPhone… - Apple Community

If your device is frozen, make sure that it isn't just being slow. Quickstart can take quite a bit of time.

If you are sure it is frozen, restart your device, then start Quickstart again.

Read this support article to learn how to restart your iPhone --> Restart your iPhone - Apple Support

If that does not work:

Click on this link to learn how to force restart iPhone --> Force restart iPhone - Apple Support - select the correct iOS version

Then

Use Quick Start to transfer data to a new iPhone or iPad - Apple Support