Hi! I’m definitely not an expert on this, but, from what I have heard, traditional methods of stretching your feet aren’t very effective. Check out this passage from an article in Dance Magazine…
Forced Feet: Don’t Sit Tight
Dancers sometimes use gadgets or extreme pressure to achieve well-arched feet. Some ask a partner to push their toes toward the ground when they are sitting on the floor with their legs extended, or have them sit on their feet while pointed. Needless to say, these tactics put the entire ankle and foot in jeopardy.
“That kind of force can stretch the wrong joint,” says Henry. “Pointing the foot requires mobility in the ankle and foot joint, and the amount of give needed at each joint is different for every dancer.” If you’re not satisfied with your arch, have a physical therapist recommend exercises that are tailored to your particular feet. Henry says stiffness in the front of the ankle is the most common complaint she hears. To help release the ankle, she suggests sitting on your heels in a kneeling position, keeping your spine long to apply low-level pressure.
So, it might be an idea to have a trained professional look at your feet and you point and work out what is restricting you and how to improve it.
I hope this helps and good luck!