I started fasting for skin reasons, it really helped my acne in my late teens/early 20s and overall brightness. At the time my weight way in point. I still did my skin care routine as needed- but nothing more (no masks, peels, etc) and I made sure to drink lots of water.
Try a 48 hour fast - see how it goes! It really helped my skin. From what I understand, your goal for ski clearing is to kick into autophagy. Using a tracking app might help you know when this happens.