Heel Grips, Forefoot Cushions, etc.
Apara makes a ton of shoe accessories that I can’t live without (for obvious reasons). My two favorites are printz, which are cushions for the ball of your feet that can even be used with sandlals, and Heel Appeal, which keeps my shoes from slipping off. There are lots of other gel cushioning products which come in really handy when I find a pair of size 8 shoes that my size 7s slip out of. A simple gel insole does the trick!
Dr. Scholl’s has some of these products, too.