How can I downgrade to the free membership for this month?

I was just billed for bronze membership but I will not be needing it as I do not receive that many forms.

Please check this guide to learn how to downgrade your subscription: https://www.jotform.com/help/341-How-to-Downgrade-Subscription-Back-to-Free-Account 

I see your subscription renewed today, do you want to downgrade it immediately? If yes, please confirm, so we can refund this recent charge.