Your heels may be too big for a variety of reasons — here is a quick, easy, and affordable fix for that problem: heel grips!
I got mine at CVS for ~$3.50. Make sure you don’t buy “heel liners” by mistake! Heel liners are not textured, and they don’t make my heels easier to walk in. I have tried other brand heel grips and none have as good of a "grip" as the CVS brand.
The texture helps prevent your heel from slipping out of your shoes.
Apply it to the inside of your shoe where your heel is. The back of the heel grip has a strong adhesive.
I found it most effective to apply as close to the top as possible. Make sure it doesn't stick out over the shoe.