My first bout with PF years ago a cortisone shot took care of it immediately.
The second bout the cortisone shot had little to no effect. I had to really take it easy and cut way back on walking. Be careful with what I would wear on my feet (no sandals, flip flops etc.) Wear more supportive shoes with inserts, and do foot stretches throughout the day for that plantar.
Thankfully it healed, and I was able this summer to go back to flip flops, (I hate shoes in the summer) but I'm having a really hard time getting back into my walking routine. I lost that habit while trying to recover...