Fix mistake made halfway between transferring from Android to iPhone with iOS app

Is there any way to start the process of migrating from Android to iPhone using the iOS app (com.apple.movetoios) from scratch, after I made a mistake during a previous attempt? The process of moving from Android to Apple is strange, poorly documented and time-consuming. I made a mistake during the step where on the Android device, using the iOS app, I had to select many rows of data to transfer. I did not see that I had to scroll for more rows, I was excited that after many attempts Apple finally presented the 'transfer screen' and I wanted to move on before any of the 3 devices necessary during the process went back to sleep or ran out of power. As a result, only part of the personal data from Android was transferred to the iPhone. I wiped to iPhone yet again, to try and fix it, but now Apple installed the iPhone with the partial data that was already tied to the iCloud account. The problem is, I used a real name to create the iCloud account and it's my child's account. If I make a new iCloud account it will always be the Childsname Lastname_1 account. (but maybe that is the price to pay)