I would recommend these steps:
1. Export all of your report from current QBO account for archive.
2. You are unable to purge your current account. So you have to open a new QBO account
https://quickbooks.grsm.io/EU
3. Set the opening balance of each account start Jan 1, 2020
https://quickbooks.intuit.com/learn-support/global/getting-started/what-s-an-opening-balance/01/3830...
4. Prepare any data for this year to be imported into your new QBO account. Utilize a 3rd party tool for certain transaction types if required (e.g sales receipt).
https://transactionpro.grsm.io/qbo
5. Don't forget to cancel your old QBO account.
Good luck!
