I personally find the best way to keep my blood sugar under control aside from insulin and a low-carb diet is exercise. Cardio is a very helpful way to keep your blood sugar level, it really helps to pair that with CGM in my case the Medtronic 670G. I set my insulin pump to a target blood glucose of 150 (instead of the regular 120) about an hour before my workout, which limits my lows to almost non existent. The Medtronic 670G also has "auto mode" which will lower or raise my basal based on trends.
The only other regular daily factor that is important to me is stress, stress has a huge effect on my blood sugar. The more I can keep myself reasonably relaxed throughout the day the better my numbers, and I tend to be very non-chalant as a result.