After lowering Insulin, how do you eat?

As my Insulin has been approaching the normal range after months of Metformin and low carb/low sugar, I’ve started to wonder - what happens when I’m within the healthy range? Does anyone here have experience with getting your Fasting insulin to a healthy number? And if so, what does your diet look like now? Do you maintain a strict diet? Allow treats now and then? Eat totally unrestricted? Please share your experiences