Ways to lower blood sugar

I am worried about diabetes. My blood sugar levels keep coming up high. My fasting blood sugar also exceeds 120. There is a family history as well. Two years ago, I was diagnosed with hyperlipidemia and took medication for about a year. Since then, I stopped the medication, but my blood sugar has risen again, so I am concerned. To reduce my blood sugar, I eat brown rice and try to reduce sugar intake, but I am not very successful. How can I keep my blood sugar levels low?