I will make some assumptions. When you say your blood glucose is low you have measured this and had it confirmed. You have no known underlying medical condition that is producing this effect. If you are overweight and in particular have visceral fat surrounding your pancreas and liver then the function of those two organs will be severely compromised. You need to reduce the amount of visceral fat and increase the functioning of those organs. This is not a quick fix and will take 6-12 months depending on your current state. Fasting will help and whether you have nothing, one or two meals is up to you. What is more important is that you change your diet so that sugar and processed carbs are eliminated. You don’t have to go keto, but the carbs you eat must be locked in fibre. That means non starchy veggies, some fruit, select the more tart fruits, beans, legumes. Fats like cheese and plain greek yogurt. Avoid sugar, and processed grain based carbs like bread, cakes, biscuits pizza, breakfast cereals. Do not eat anything that your great grandmother would not recognise as food. No alcohol as this just adds to the visceral fat around your liver.

There is no magic bullet. You want it? You need to put in the hard yards. Good luck.