People cancel last minute (anywhere from 30 days to 24 hours, and sometimes less than that) all of the time. Sign up for Touring Plans reservation finder and also with ***********. There probably won't be many texts about availability right away, but as it gets closer to your trip (at 60 days when FP reservations are made and also at 30 days when packages have to be paid off), things will start popping up.
There's no guarantee you would have gotten these reservations even if you had known earlier that you could book for your entire trip. There has been much frustration on this board lately with people (myself included) with trips in November who have not been able to get dining reservations. For some reason, November has been a very difficult month! I have never experienced this much unavailability (or frustration!) when making ADR's! We were at WDW for spring break, including Easter, (supposedly even bigger crowds than the days we'll be there in November) and was able to get everything I wanted then. Not so much with this trip.
Another idea is to split up your party. It's not ideal, but if you can get in that way, it's better than nothing! This is especially helpful if you've got a very large (like 10 or 12 person) party. Yet another option is to look for ADRs for a number one larger than your party. So if there are 5 of you, also search for (and take, if one is available!) ADRs for 6. They'll almost certainly still seat you.
Good luck!