Just to pad my post count, let me repeat everyone else's advice... keep trying...lol
Daily, multiple times a day. It might open up for a few minutes, then someone takes it. It happens. I got 7DMT the same day, while I was standing in line waiting for another ride. Just mindlessly poking away at the app, and after about 10-15 minutes of that, it popped up... i grabbed it. It was for a few minutes later! Total luck, but things like that happen all the time. Also stand by lines for A&E are down considerably vs last year. Still long/busy but the days of 3 and 4 hour lines for A&E are about gone.