To walk or not to walk?

I looked at tons of articles about plantar fasciitis, and as few articles said that your feet need to rest and any activity undoes whatever healing happened while you were resting. After my last treadmill broke, I went 3 weeks without walking and barely left the house. My feet weren’t any better. I’ve been walking on my new treadmill 30-45 min a day, 4-5 days a week. Other than that, I’m sedentary. I don’t know if I should stop all walking and be completely sedentary so my feet can heal, or keep walking because I probably still am not getting enough exercise. (PS: I’m overweight and I want to walk more so I can lose weight.)