I had a fallen arch on one of my feet for as long as I can remember, and doing mindful stretching daily is helping me fix mine. It's a really painful process, if this is anything like yours. Muscles were far too weak in the areas required to use my feet properly, all over my legs.
I'm not a healthcare professional but I would start with stretching your hamstrings like the article says and stretching your feet, getting to know the muscles that you have down there and how they work when you move your feet. You can follow a course or a guide, it may help, but know that every situation is different and you need to listen to your own body, experiment with some motions that you've never tried. Guidance might be good at first, but just don't stop listening to your body and try to avoid making it do something it doesn't want to do, but be aware of it. Unconscious avoiding of stiff or painful muscles gets you in this mess, so if you catch yourself mindlessly going through the motions (it does happen, often), take a moment to assess what kind of trouble you're in at the moment, muscle-wise.
Strengthening all of your leg muscles will help awaken the nerves in your legs. I can't remember the name, but it's a huge one that runs from your hip all the way to your toes that is the culprit of flat feet. Help your legs do work the right way, and then you'll start to see that you don't have to put much conscious pressure on the front of your feet at all to stay in balance.
I'm not a healthcare professional but I would start with stretching your hamstrings like the article says and stretching your feet, getting to know the muscles that you have down there and how they work when you move your feet. You can follow a course or a guide, it may help, but know that every situation is different and you need to listen to your own body, experiment with some motions that you've never tried. Guidance might be good at first, but just don't stop listening to your body and try to avoid making it do something it doesn't want to do, but be aware of it. Unconscious avoiding of stiff or painful muscles gets you in this mess, so if you catch yourself mindlessly going through the motions (it does happen, often), take a moment to assess what kind of trouble you're in at the moment, muscle-wise.
Strengthening all of your leg muscles will help awaken the nerves in your legs. I can't remember the name, but it's a huge one that runs from your hip all the way to your toes that is the culprit of flat feet. Help your legs do work the right way, and then you'll start to see that you don't have to put much conscious pressure on the front of your feet at all to stay in balance.