Fat fasting did not work for me, I regained it all. And as Glenda said, you should really be fat-adapted already to do one successfully (keeping the calories under 1,000 while eating all fat).
To start/re-start, my suggestion is "just do it". Get your carbs to below 20 g., count and measure to be sure that habits learned from previous tries do not interfer with "the plan". "General Low Carb" does not work to get you into ketosis. Going "on and off" general low carb diets for 17 years has not worked for you. There is no magic to LC. As Lisa here writes: "Dieting is hard--don't let anybody try and tell you it's not. Being fat is hard. Pick your hard. " More starting tips from members here:
http://forum.lowcarber.org/showthread.php?t=405273
#1 is Pick a plan. I suggest a strict LC plan with a simple food list to follow.
https://www.dietdoctor.com/se/wp-co...starch_diet.pdf
Measure out only 2T cream, only 4 oz of cheese (that is a small amount, smaller than you think, even better none for the first two weeks), No nuts, No alcohol. Calories are Not limited, so if you do get hungry, you can eat from the allowed list of foods. (You cannot go over 1,000 on a fat fast, and being satisfied with the food is important)
Dr Naiman summarizes this type of LC plan as MEAL.
https://www.dietdoctor.com/m-e-l-di...-rapid-fat-loss Simple list, and the added fats are only the minimum you need for cooking and satiety...no BPC, no fat bombs.
Go can do this! Welcome back