@machoo 

Prepare your new blank QBO Plus account

https://quickbooks.grsm.io/EU

then you may have 2 options:

1. Utilize a migration tool. i.e TP Exporter for Desktop, TP Importer for Online

https://transactionpro.grsm.io/qbo

2. Purchase a 3rd party conversion service.

Click my profile name and send a private message for details.