Making little color-coded envelopes for my wallet cards out of construction paper and washi tape. I labeled the outside of the envelopes with what rewards are best to put on that card at the time; i.e, Chase Freedom 5% bonus reward categories are Walgreens, Gas, and Lyft through October, when they switch to Department Stores, Warehouse Clubs, and ChasePay.
My debit cards are in one, my insurance cards in another. Now I can get through a checkout process without fumbling and trying to remember which card I should charge what tranaction to, or handing the dental receptionist my vision insurance card. The construction paper was bought on clearance years ago, and 5 rolls of adorable washi tape cost a total of less than $3. Fun crafts on a rainy afternoon that will keep me from being frustrated later.