I see your listing is in New York, so Jan/Feb is winter for you. Is winter the off season in the area where you're located? If so, off-season bookings can have a tendency to be much more last-minute. Guests assume there will be availability at a reasonable price, so they don't commit early on. You can get booked out for the off-season, but you have to be more patient and (if still unbooked very close to the dates) more creative (promotions, etc.).