Keep checking. Keep checking. Keep checking. It’s mentioned on other threads I’ve seen and I now know from direct experience that this is true.
My mom and I are going at the end of April but didn’t book until end of December, long past the 180 day mark. Even then, I didn’t start looking for reservations until mid February as it’s my moms first trip and I wanted her to have a chance to pick.
I checked every day or two until I finally got a reservation for 9:25pm on our magic kingdom day. Then, as that would mean missing Happily Ever After, I continued checking until yesterday when I was able to modify it and change it to 9:20pm on our arrival day.
Don’t give up checking. People cancel all the time.
Otherwise, what the above posters mentioned about a big breakfast should be good. Go to Ohana hungry, because you ain’t leaving that restaurant empty.