If your SGPT elevation is due to fat in the liver
then the only way to reduce it is by diet and exercise. You should avoid alcohol as much as possible. Your ideal BMI should be around 20 to 25.
You will be at an increased risk of diabetes
in the future given your strong family history so the best way to delay or avoid it is by taking care of yourself starting right now.
Make sure your doctor tested you for other conditions that can cause elevation of liver enzymes, such as hepatitis B
, hepatitis C
, autoimmune liver disease, etc.