Interesting. For me PF gets worse when I walk more. Even with special soles. Still trying to figure out what works.
The first is hanging your heels off a step and letting them stretch down, both with straight legs and bent knees (one foot at a time).
The second is putting your heel as close to a wall as possible, with toes on the wall.
Both work better with sneakers on.
Stretching and rolling with a small foam roll helps me as well.
Every time I wore shoes that were too narrow my problems multiplied. Reworking the laces helped a bit but it was not enough and I had to switch brands.
But it’s more than wide boxes. For example I had some nice big New Balance and they were horrible. I think mainly because of the cushions. ASICS work best for me.