Ideally, avoid anything that aggravates it for now. It is an inflammatory issue so it will not be able to heal if it keeps getting aggravated.
That being said, if ski touring, you could try to use your high heel bars to get your heel lifted. One of the treatments for PF is to use a heel lift in a shoe. It is usually caused by tight calves and big toe extension range of motion. So stretch those areas. If your PT does dry needling, that can help but beware it does not feel good.
You could try the painfully mindless step up workout and see if that hurts. Doing stairs minimizes the dorsiflexion movement that causes pain in the PF so step ups might be okay.