Great job! Congrats on the progress, and welcome to ketosis.
A lot of the 17 lbs is water loss, so don’t get discouraged if you gain some water weight back once you start eating.
However, if you want to keep the water weight off, try changing your diet to a Keto diet. Most Keto eater take 4-5 weeks to get into ketosis by just eating a Keto diet without fasting. You already got there in 6 days, and your body is already adapted to burning fat for fuel. So don’t waste what you had achieved.
Good luck on your weight loss and health improvement journey!