The points have to be used by the end of July if they are banked. If any of these points are from this year's Use Year, you could cancel now and still bank up to 50% of this year's points. Anything over 50% and the banked points have to be used by the end of July. You could either try to rent the GV, use the points for another trip yourself by booking a reservation or use the points to make new reservations that you are going to rent. I also think you might be able to put these points towards booking an outside timeshare reservation within the next two years but I'm a little fuzzy on how that works.