Hey there Plm47,
Thanks so much for using Apple Support Communities.
If your data transfer didn't finish for any reason, you may want to give it more time. Depending on the method of data transfer, it may be dependent on network speeds which can vary from network to network. Giving it more time may prevent you from having to erase and start over. However, if you're ready to try that process again, we'll share some information below which should help.
- When you're ready to restore your iPad to factory settings, this article should help: Restore your iPhone, iPad, or iPod to factory settings - Apple Support
- After that, you can follow the steps here to try the data transfer again: Transfer data from your previous iOS or iPadOS device to your new iPhone or iPad - Apple Support
We hope that this information is helpful.
Have a great day!