Let me walk you through the steps on how to cancel your subscription.
Here's how to cancel an account:
Go to the Gear icon and choose Account and Settings.
Select Billing & Subscription.
In the QuickBooks section, click Cancel subscription.
Click Continue to Cancel, then Continue to Cancel again.
Answer the short survey, then Click ConfirmCancel.
Another way to cancel your account is by reaching out to our QuickBooks Care Support. They can pull up your account and cancel the subscription for you.
I'm adding this article to become more familiar with the process of canceling your subscription to QuickBooks Online (QBO): Cancel your QBO subscription or trial.