Issue
I need to increase the number of Cron monitors but I cannot do this above 1.
Information
Every Sentry organization has access to a single monitor for free.
Any additional monitors will cost $0.78 USD/billing cycle, and are accrued to your on-demand/Pay-as-you-go spend when activated.
You can configure an On-Demand spend / pay-as-you-go at the bottom of your Subscription page if you are on a paid plan.
If you will only be using On-Demand for Crons you may wish to configure per-category on demand.
Note: per-category on demand has been deprecated and is not available on all plans.