I think you'll still get it if you keep trying. Just for fun, go check out what ADRs are available for today and tomorrow. There are a ton of coveted ones available. BOG, Beaches and Cream, CP, etc. They come up for grabs at the last minute all the time. The problem is that if you have an ADR for your "second choice," and it's too late to cancel, you can't take advantage when your first choice comes available.
If you don't mind taking the chance, just don't make an ADR for your MK day. Just make sure everyone is aware and ok with the fact that it's possible you may end up eating QS. Then, just keep watching for what pops up. Have a second and even third choice in mind. So if it's the day before and you still haven't seen a BOG and a CRT pops up, maybe go ahead and grab it.
We've never gotten our ADRs much in advance and have gotten into BOG, CRT, Beaches and Cream, LTT on Thanksgiving day (that was a coup!), and many others this way. The key is being prepared for disappointment, just in case. But we've always gotten something we were happy with, even if it wasn't our first choice.