keep checking like a madman. I check at least sev times a day in advance of my trip and thus far, have been able to secure a 50s res at 12:30 for lunch and a 6pm scifi for dinner on my HS day of 4/8/21. things do pop up. otherwise, touringplans has a free finder service, but they only alert you via email unless you pay a membership fee to get texts. I use ***********. $9 a month....month to month and it texts you when parameters are met. If you get a text, drop whatever you're doing and don't bother with clicking the link....i've found its much quicker to just open the app and do it that way. by the time you click on the link and wait for the page to load, it'll likely be gone. Worst case- try and join the waitlist from the app right at the start of the lunch or dinner period..and as always, the day before is a good time to check, since people cancel in order to avoid the cancellation fee.