QB Issue Resolution:

if you are within the first 60 days (90 for non-US accounts) of starting your subscription Log into your QBO account, then look at your home page URL, it ends with /homepage, replace the homepage with purgecompany and hit enter (this deletes everything in the accounting)

other wise you either delete everything one transaction at a time

or cancel this subscription and start a new one
Note: Purge does not work at all for simple start, cancel and start a new subscription

Resolution for Issue 'How do I delete (wipe out) all my data and start over' available: Yes (Solved).
Source: Intuit Community forum.

How do I delete (wipe out) all my data and start over: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for nonUS accounts
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