To downgrade your Iconfinder Pro membership, please follow these steps.
Log into your account and go to My Account page, by clicking on your name at the top right corner or the page.
Click the Change Plan button from the right side of the page in order to change your subscription plan.
Choose which Pro Subscription you want to continue with. On the right side of the screen, you will see the details of the new subscription plan and the prices. When you finish selecting the new subscription plan, click on the "Downgrade now" button to finish the process.
If you have multiple users on your Pro subscription, you have to delete these users from your plan before you can downgrade.