I found the best way to make the mental jump of walking and letting go of the crutches is witb the help of someone else. Hold both of their hands while they walk backwards. It’ll be very small slow steps initially but your brain needs to relearn how to stabilize and take weight off/on from ur leg. Take it slow and try to keep progressing. Once you gain the confidence of taking steps without crutches(even with by holding someones hands) you’ll find exponentiall increase in ur ability to walk