Thank you for posting here in the Community, @office-moonautom. And I can definitely help you start over with new books in QuickBooks Online (QBO).

Since you're using your QBO for years now and want to start from scratch, you can cancel your current account and start a new company with the same user ID and password you used before. Let me guide you how.

First off, let's cancel your current account. Here's how:

1. Sign in to your current QuickBooks Online account.
2. Click the Gear icon, then select Account and Settings.
3. Go to the Billing and subscription menu.
4. In the QuickBooks tile, click Cancel subscription.
5. Follow the steps to cancel your account. If you use payroll, you should cancel your payroll account too.

Then, you can now Sign up for QuickBooks Online using the same user ID and password to start a new company.

I'm adding this article for more details: Delete your data and start over in QuickBooks Online.

Please know that I'm just a reply away if you need any further assistance with QuickBooks. Wishing you and your business success.