DVC resorts sell out to 100% occupancy 100% of the time. All timeshares are sold that way, generally. What makes DVC somewhat unique is the fact that most DVC members use most or all of their points all of the time. Why is this different? Most timeshares have a lot more availability almost all of the time because usage isn't anywhere near 100%. People simply don't use as many of their points which leaves more overall inventory available with those timeshares.
One of the beauties of DVC also becomes one of its liabilities. It's the nature of the DVC beast. It's one of the things we don't talk about a lot, like high DVC use weeks in December, marathon weeks, Easter, July 4, etc., but it does matter. And it generally makes DVC harder in general to book than most other timeshares.
A thought, if I may; that I have seen posted here time and again that we mean no harm by. You were promised a room. Not any particular room. At any particular place. Nor at any particular time (days). With most timeshares, this doesn't matter as much. With DVC, nothing is more important than your 11 month advantage at your home resort. Most times, it does get you a room at least somewhere when you want it. Even that doesn't work sometimes. There are a lot of great and often overlooked DVC resorts. 7 months can be your friend as well. Your contract is fairly long. Sleep around.
You may find a new favorite, Look at it as new opportunities for new experiences and your DVC journey will be a much more pleasant experience.