With one of the Chase Freedom (and Chase Freedom Flex) 5% Cashback categories being Live Entertainment, I believe you can use this for ticket purchases to theme parks, including Disney parks based on last year when Chase ran this.
If you plan to buy any Disney parks tickets, including hard ticket events like a After Hours party, Mickey's Not So Scary Halloween Party, Mickey's Very Merry Christmas Party (once those tickets go on sale), you can get 5% Cashback.
Combine this with the 12% off Coupon (RMNAPP12) available for TripAdvisor (only for purchases made through the app) for a total of roughly 16.3% off the price of tickets. It is only about 10.3% off the price if you have an Annual Pass or DVC discount and you buy hard tickets on a date with the $10 discount, so using a DGC through Disney direct could be better depending on how much of a discount you're getting on your DGC.
I am pretty sure TripAdvisor qualifies for the 5% cashback from what I remember last year.
You can also look to see if Viator (same company as TripAdvisor) has a decent coupon and combine with cashback, but I've found the 12% off to be the better discount most of the time.
Just bought my tickets this morning for
MNSSHP in September!