Weak foot arches and bunions: can exercise fix the problem?

The arches of my feet always hurt. I have a low arch (I think), bunions, and I believe my arches collapse/“fall” or are weak. I may also have some ankle alignment issues but not certain. I stack three books on top of each other, stand on top and do a step down on one leg 10x for three sets each leg. When I do this I notice one thing that hurts is my arch of the foot. I also tried skateboarding and the first thing to start hurting is the arches of my feet…Skateboarding does a similar movement where you’re standing on one leg and doing step downs. I therefore think I have weakness in my arches and want to see if I can fix with exercise. I also have hip dysplasia and clicking knees, and I have some bone issues and used to see a PT as a kid for my back. I could be slue-footed but not certain Does anyone have any insight in this and what I can do? I would so love to do exercises to help my (what I think is) weak arches/collapsed arches. I already do the ones where you put a towel under your foot and scrunch your toes.