If you need more than 10 rules, you can purchase additional packs of 10 rules starting at $50/month per project per pack. Each pack stacks on top of the previous limit.
You can cancel the add-ons at any time. The add-on (and any extra rule packs you purchased) remains active until the end of the current billing cycle. To undo a scheduled cancellation before it takes effect, use the cancel removal button in the UI.