It’s going to be tough getting something this late as it’s the busiest DVC time but you can certainly try.
To waitlist, you simply try to book what you want and then create it. If it matches, the will make the reservation.
While you do, you can also pick up days that show up. The problem with that is that there are penalties for canceling less than 31 days out so if you did pick up a day here or there, but can’t go without a full stay, then points would go into holding.
The best chances for a room will be SSR and being flexible for a split stay and room size will also help you put something together.