Strengthening

After a basis of giving your body the energy and building blocks it needs from food and normal body systems are supported through water and oxygen etc

Bare foot goes a long way - it allows proprioceptors in the feet and lower legs to work which will activate balance mechanisms which includes the muscles used to balance and support the feet, ankle and lower leg.

Getting on uneven and unbalanced surfaces.
Gets all the above working and strengthening.

Walking barefoot on uneven terrain
using balance tools (balance and wobble boards all the way to swiss balls for more advanced -standing here)

Use it or loose it. Work it (without injury and with enough recovery) and strengthen it.

Working on the injury to heal properly will go a long way.