Okay, 5.4 is good. People who have no insulin resistance typically are below 5.0.

5.4 means the average daily glucose you have is 108.

If you look on the chart I linked to you will see you are in the middle of the green area.
Frank diabetes is above 7. People controlling their glucose by diet typically fall in the high 5's to 7 range.

There is some leeway for age. A young person with 7 is more serious than a 65 yr old with 7.

So it would be a good idea to follow a conservative diet, get rid of sugars and juices, and minimize starchy carbs, and eat quality protein, and veggies. Having fruit with its fiber intact is ok in moderation. Berries, oranges, apples. The fiber slows the absorption of the sugars in the fruit and evens out insulin response.

There is alot of hidden sugar in many things. Ketchup (Heinz makes a low sugar one), tomato sauces, even salad dressings.
Use nuts in moderation for snacks, instead of carby snacks. One really needs to read labels. Even bread has sugar in it! (some brands are removing it so read the labels.)

Reactive hypoglycemia occurs with large meals, and sugar consumption for the most part. People with a rare tumor of the pancreas will also have low blood sugars.