You may have 2 ways:

1. Utilize an importer tool.

https://get.transactionpro.com/qbo

You must pick QBO Plus or Advanced to utilize the class tracking and/or location features to separate transactions from old accounts.

https://quickbooks.grsm.io/US

https://quickbooks.grsm.io/us-promo

2. Purchase a 3rd party service to merge 2 Xero accounts into 1 QBO account.