Have a backup plan. These are tough to get sometimes even at 11 months, hence once someone has one booked, they are less likely to cancel unless there is absolutely no chance of making the trip. It stands to reason that cancellations do happen, however probably less likely or as often as for other villas at other resorts.
What I am trying to say is that this is not a villa that someone might book as a backup plan and then cancel if they get what they really want. This is what they really want, as such are less likely to cancel unless something catastrophic happens to their vacation plans.