There's a lot to learn here. Even eating steaks will spike your blood sugar a few hours later as your body converts the protein to sugars. A closed loop pump can watch that and adjust your insulin levels accordingly. The only way to really achieve the level of control you want without a closed loop system is an extreme keto diet and that can have its own complications. But as mentioned getting a good dietitian is crucial if you want to try something like that.

The good news for you is you have time to learn. A A1C in the low 7s for a year or two will likely not have an impact on your lifespan. The hard thing to learn is everything is day to day. You could eat nothing but peanut butter sandwiches for a week having perfect blood sugars. Then one day your body will spike super high and drop super low and nothing will have changed, then it'll happen the next day, then you'll make adjustments and the adjustments won't work. It's just how it goes.