I do think that putting new insoles in my boots helped some. I just got the Dr Shoals for now in my mud boots and I stole the Lathrop and Sons insoles from my hunting boots for my cowboy boots.
I'm not a doctor, and I know we don't always get to choose what shoes we wear. However, you may want to consider changing your footwear if possible. From what I understand, shoes like cowboy boots and rubber boots are some of the worst shoes you can wear if you have plantar fasciitis. I could be wrong though.