Sorry to see you go!
If you are on the Free plan of Spocket, you can simply uninstall the app, and your subscription will be cancelled.
In case you are on a Paid Plan, you will need to downgrade to the Basic Plan and then uninstall the app to successfully cancel your subscription with Spocket.
Here are some detailed instructions on how to uninstall Spocket from Shopify: Uninstall.
Hope to see you around!