I’ve struggled with PF for many years, sometimes leaving me unable to walk. After many attempts and PT treatments, I ultimately found what works best (at least for me).
1. Rest (depending on the severity) and stretch, stretch, stretch (see #3)
2. Most important! Wear ”supportive” (not related to cushioning) shoes that pass the twist test. Most of your traditional backpacking shoes fit this bill. You will want to wear the both casually and when training. It goes without saying, while your foot is injured, don’t walk barefooted. Avoid zero and low heel drop shoes! I’ve used trail runners for many years, but unfortunately can no longer wear them. I wear Keens Targhee Vent Low now.
3. Do these 2 stretches multiple times a day. I would not recommend the standing over a step stretch.
#1: Runner’s calf stretch against a wall. (back leg straight) 2 sets/1min
#2 Soleus muscle stretch against a wall. (back leg bent) 2 sets/1min
Be sure not to do these stretches cold. Maybe do a 5-10min walk before.
4. Don’t do the suggested calf raises and ball under foot rolls that most PTs and internet suggest. I swear it will only make the symptoms worse. Just walk and hike routinely and stretch after. This will help strengthen the foot while not overly aggravating the plantar. Makes a big difference.