Feel better smaller waist clothes fit better - Dr. Berg's Healthy Keto

Feel better, smaller waist clothes fit better. Plateaued and struggling. Eating once a day for almost a year. 20 grams of carbohydrates all that you recommend. When i don’t eat for two days nothing but coffee and water. I lose weight but when I eat again I gain it back. What am I doing wrong? Been eating Keto since May of 2015.