I'd like to change my subscription to a free plan. How do I do that?

Note: You will need Owner or Billing member permissions to cancel your plan. Additional Note: For billing-related changes made via Sentry Support, you must verify account ownership by providing either the last four digits and expiry date of the payment card on file or a recent invoice for the account.

To cancel your plan navigate to the Subscription Overview page by selecting Settings > Subscription from the left-hand nav menus.

By selecting "Manage Plan" in the upper righthand corner of this page - from the Manage Subscription page select "Cancel Subscription" below the summary.
It looks like this:

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You can also navigate to the cancellation page by going here: https://sentry.io/settings/billing/cancel/

Warning: This will lock everyone out of your account and only the Owner (you) will be able to access it as the free Developer plan is limited to one member.

Refund Requests: If you wish to request a refund for the most recent invoice, you must first verify your account ownership using the methods outlined above.
Refunds are considered exceptions and are subject to approval since they go against Sentry's Terms and Conditions.

Important: If you plan to delete the organization entirely, cancel the subscription first. Note that deletion is permanent and irreversibly removes all data associated with the organization.

Additional Warning: Cancellations take effect at the end of the current billing cycle. To avoid additional charges, ensure you cancel before the renewal date.