You've tried all the diets
Atkins, Keto, Southbeach, Mediterranean, IFYM, Weightwatchers, CodeRED, Paleo, Vegan, calorie counting, low carb, low fat, Raw Food, juicing, Slimfast, Bloodtype... and so on. The number of diets to choose from is endless and there are more being developed all the time because it's a $65 billion+ industry.
