Winged scapula are often a result of the shoulder blade not being able to glide freely on the ribcage due to compression within it (poor breathing mechanics). This causes the scapula to deviate outward in an attempt to find more movement.
If your feet are flat, you are not going to get your arch to “re-rise” without a lot of help, especially from something like an orthodic. Pay attention to your pelvis because it’s a primary factor.
High arches prevent the arch from dropping and lowering into the ground in walking/running. This causes a lack of “yielding” into the ground which can result in many compensations. In order to address this, we should re-teach the missing link: Pronation and also likely internal rotation.
Our brain is seeking stability. But we need to be able to go through the “typical” gait cycle as normally as we can if we are to conserve the most energy. If we lack a range of motion we do not possess, compensations can occur up and down the chain to “find” that range of motion that might be lacking where we need it.