I saw other clips taken, you really need to be barefoot, the boots and socks don't give you a good view of what is going on.
As for exercises...you really need to get a thorough assessment of function done and get a individual program according to your needs.
*If you stretch some muscles without strengthening others you risk further instability problems.
*If you don't strengthen specific muscle, in a specific way, you risk overusing already dominent muscles and missing the ones that really need the work.
As mentioned previously, if a muscle is not fully innervated you will not be able to fully strengthen it.
Your best bet is to see a specialist.
Good luck.