Here’s a tip about Fastpass at Disney World:
Be aggressive when using the My Disney Experience app to select additional Fastpasses once your original three are done. Never give up on a certain ride or a certain time. People are always changing their Fastpasses which makes Fastpass availability change every second. Therefore, you can refresh the available Fastpasses by selecting different times at the top of the screen. It is possible that rides that aren’t available at all now will be available the next minute.