Triceraptors you need to get off ketogenic and back on to a more normallised diet and build your muscle back then at some future date you can go back to keto or fasting
if you are losing muscle mass or your muscle is flacid you need carbs and protein
There are many on the forum that would swear by low carb and many that have been on it for years and would not go back but you have to ask how many of them have lost significant muscle mass