As a retired endocrinologist, I highly recommend continuous glucose monitoring to help with appropriately dosing insulin. When CGM came along, I had all sorts of insights in how insulin is most effectively taken. Adjustments in the timing of insulin before a meal and making appropriate modifications for both the carbohydrates to be eaten as well as premeal glucose levels generally results in more effective insulin dosing. Alarms for low blood sugar are also a great feature of the CGM systems. I won't bore you with long explanations but will give additional information if you are interested.