Clean or Dirty Fast?

I am 51F, 118kg, 5'7". I have lost 16 lbs since Jan 25. I just completed an 86 hour water fast and want to maximize weight loss over the next few months. I am considering doing rolling 48s or possibly weekly 24, 48, and 72 hour fasts. I did my most recent fast clean, so definitely dipped into autophagy. My question is: is it easier to promote adherence and prevent muscle loss by having one or two protein shakes (30g protein, 150 cal) on fasting days (like FMD) or try to water fast. How important is autophagy, especially to reduce loose skin? I'm frequent at OMAD but rolling multi-day will be new for me. Thank you for any advice!