I appreciate you for taking the time posting your concern here in the Community. We're sad to let you go but we're happy to help you out on cancelling your account.
You can cancel your QBO account on the Billing & Subscription page. Then, your data will be available in a read-only access for one year from the cancellation date.
Once you're done, we'll send the account administrator an email that confirms we canceled your subscription.
For additional reference, you can check these articles about cancelling your subscription or if you'd like to reactivate your service in the future:
Please know that you're always welcome to post again if you have any other concerns related to QuickBooks. Have a good day ahead!