You are not fat because you have insulin resistance, but have insulin resistance because you are fat. You are eating more food than your body can handle.
Nobody puts on big amount of weight without metabolic consequences.
The insulin-carb model has been disproven by science again and again and again. It is only popular on social media or internet and usually the speakers somehow benefit financially from it by either ads on YouTube, books, memberships and so on.
Low carb, low fat, fasting, or whatever all come down in the end to eating less calories than previously. There is no magic in anything. For some low carb works really well, for others,
You want/need to lose weight, you need to eat less.
Food is not only calories, but evert bite has an impact on your health and metabolism (the way your body processed energy), so maybe be kind to your body, and pick food that is beneficial such as vegetables, fruits, legumes, whole grain and ditch all industrial food.