Thanks for posting in the Community, ngahirakaw-gmail. I've got the steps to cancel your QuickBooks Online subscription.
Sign in to QuickBooks Online as an admin user.
Go to Gear icon ⚙ and select Account and Settings.
Select the Billing & Subscription tab.
In the QuickBooks section, select Cancel.
Follow the steps on the screen to cancel your subscription.
After you cancel your subscription, your data will be available in read-only access for 12 months. We recommend that you export or print your data before cancelling your account.