As much I don't want to see you go, but I can show you how to cancel your QuickBooks Online subscription.
There are just a few steps to get this done. Here's how:
Click the Gear icon in the top right corner.
Select Account and Settings.
Choose Billing & Subscription.
Tap the blue Cancel link beside of the Subscription Status.
You'll be asked if you'd like to call in, change your plan, or Continue to cancel.
Then, you'll receive an email confirmation that you canceled your online subscription plan. For more details about canceling your subscription, you can check out this article: Cancel your QuickBooks Online subscription or trial.