our property is still not bookable

To check your setup Open Rates & Availability, Calendar - use List view.  Dates should be in Green if available.  If not look at if Open/Closed, rooms available, Rates set.  You can use a Bulk edit to update if needed.

You have posted this on the partner forum so we cannot help further. 

Contact booking.com help team using Inbox icon on Extranet (Option booking.com messages) or give help team a call see link for local phone numbers. 

https://partner.booking.com/en-us/help/where-you-can-reach-us