These exercises are for your right foot. Switch sides for your left foot.
Sit in a chair or stand with both feet flat on the floor. Press down with the ball of your right foot, but only on the left side of the foot, just under the big toe.
Then pull the bottom of your big toe back toward your heel. This should pull up the arch of your foot. Don’t flex your toes while doing this. It is a subtle movement of the arch.
Hold for 5 seconds. Relax.