The important thing to remember is that glucose in the blood is only the symptom, not the cause. The cause is too much glucose in the body. If you eat to the meter or use it as a “fuel gauge” you are only measuring the excess that is spilling into the blood.
Many people have this idea that sugar only exists in the blood, as glucose, and in the muscles and liver, as glycogen. The truth is that almost every cell in the body can use glucose and become engorged with it. The blood carries glucose around the body, but when the cells cannot accept any more, and when the liver has run out of places to stash it as glycogen and fat, it begins accumulating in the blood. This is all you are measuring with a glucometer - the overflow. If you truly want to beat insulin resistance then one must focus ruthlessly on carbohydrate restriction irrespective of what is appearing in the blood.
If you’ve been on a keto diet for a year and you’re still struggling with blood glucose then you may be sensitive to protein. Fasting will definitely help. The aim should be to drain the sugar from the body, not negotiate with a glucometer and unwittingly top it up.
All the above is my view only and is not meant as prescriptive advice.