Last year I had plantar in my right foot and it was so painful that any weight on the foot was just excruciating and walking was difficult. Crutches were needed at one point. I read everything I could on plantar, asked questions and tried different methods to correct it. One of the things I did was buy Superfeet but for me they didn't work and I got better results from just regular inserts. I'm sure they will work for most people but for my foot with a very high arch they just didn't work out. I am not knocking them and suggest an insert that works for you, you may need to try a few before you find the one that works.
What did work was the other things I tried. I bought the foam wedges that you stand on to stretch your feet and used them daily. I did stretches before bed and again in the mornings. I filled a bottle with water and froze it then rolled my foot on it several times a day. I avoided going barefoot or just in my stocking feet like the plague and put inserts in all of my shoes. The thing that seemed to put me over the top was the purchase of a new pair of fleece lined Krocs. I started wearing these almost full time as they brought me so much comfort. Now almost a year later I have been pain free for months without a hint of discomfort.
It is unclear just which thing finally got rid of the pain but I would suggest learning as much as possible about plantar from many sources and trying everything possible to get rid of it. It can be beaten with the right procedure.