I think what you're already doing to treat it will work eventually. I had PF last year following hip surgery. I was instructed to do what you're doing now and it only lasted two or three weeks.
Leaning against a wall is good but if you can make some sort of wedge to increase the angle of your foot it helps a lot.
I know everyone recommends support in your shoes, but for me the solution has been moderate support plus ample cushioning. I tried the (green) Superfeet and they were very painful, way too hard. I tried custom orthotics for my ski boots about 10 years ago and found those way too hard as well. I get relief from Dr Scholl's insoles sold at Walmart. Sore Soles for my regular shoes:
https://www.amazon.com/Dr-Scholls-Re...27s+sore+soles
And these for my hiking boots because they're extra thick:
https://www.amazon.com/Scholls-Odor-.../dp/B00IN43NTA