Iv had plantar fasciitis. For me going ‘barefoot’ resolved it completely. I now haven’t had an issue in years.
For others insoles seem to work but I had a collection of them previously to barefooting which didn’t help.
Now I am either in zero drop flexible soled lightweight shoes, or ariats, or using Footreviver insoles (for cycling and alike).
If going barefoot hadn’t had worked I would have had shockwave therapy on my arches as I have had had good results in other areas that I have injured with shockwave therapy.