Cancelling your subscription and deleting your account are different things. Cancelling stops the billing and leaves your work in place. Deleting removes the account and its contents.
To cancel, go to Settings > Billing & Plans, open Manage Subscription, and choose Cancel Subscription.
To delete your account entirely, contact Avenue Support from the Help Center. Deletion is permanent and takes your properties, tours, and edited photos with it, so download anything you want to keep first.