There are two ways to cancel Oberlo: uninstall the Oberlo app or close down the Shopify store.
Uninstalling the Oberlo App
Go to Shopify admin > Apps page and click the garbage can to delete the app.
Closing Down the Shopify Store
If you decided to stop running the e-commerce business, you can directly close your Shopify store. By doing this, the Oberlo app subscription will be cancelled automatically.
Resubscribing Back to Oberlo
If you change your mind later on, you can always resubscribe to Oberlo. Just install the Oberlo app, and all products will be synced back.