Thanks for laying out your concern with us. I'll share some solutions to make sure that you can reset all of your data in QuickBooks Online (QBO).
We can wipe your data and start over if your books are less than 60 days old. Please know that this is only applicable to QBO Essentials, Plus, and Advanced subscribers. Follow these steps to completely clear out your books:
Look at the URL in your browser's address bar. Delete all the text after the last / and enter purgecompany.
For example: - Before: https://...qbo.intuit.com/app/homepage - After: https://...qbo.intuit.com/app/purgecompany
To confirm you want to delete your company data, type Yes.
Select Wipe data.
However, as Fiat Lux - ASIA mentioned above, we'll have to cancel your QBO subscription if your books are 60 days old or older. Then let's create a new company. Here's how:
Go to Settings and then select Account and Settings.
Select the Billing and subscription tab.
Click Cancel subscription.
Follow the onscreen steps to cancel your account.
After that, you can start a new company by following these steps: