There are many different types of aids to help make a shoe more comfortable even after "breaking them in," and can be purchased at shoe stores, large retailers, and some drugstores. These include special small gel pads for the balls of the feet, heel inserts to help minimize chafing at the back of the shoe and rough patches to glue onto the bottom of a slick sole, affording you better traction.
Keep silica gel packets in your shoes when they’re not being worn. Have you noticed after purchasing a pair of new shoes those little white packets containing tiny clear balls inside your shoe box? Those packets contain silica gel which absorb moisture and keep your shoes from shrinking. Hold on to those packets instead of throwing them away and stick them in your shoes when you’re not wearing them. You can ask a shoe store associate for extras, if necessary.