This won't work very effectively. Your best bet is to fast (water fast) for as long as you can, if you can't then add protein (not carbs). Potatoes is very rich in carbs, your body won't go to ketosis (using fat as fuel) thus you won't see much impact. I also recommend getting smart meter and measure your fat percentage daily so you can tune your diet.
Actually potatoes are mostly water. They’re packed with nutrition.
I've fasted for 35 days and lost 15 kilos in 2 weeks, I think I know how to lose weight effectively.
Here is my data
https://i.ibb.co/rydPXDR/Screen-Shot-2020-10-22-at-3-07-52-P...