I would suggest yo have an HbA1c test done, to indicate where your blood sugars have been running over the last 2-3 weeks. From there you can formulate a plan.
If you carry any excess weight, then trimming up a bit would likely help, whether prediabetic or not.
If you do transpire to be pre-diabetic, then the essence of your required actions would be a review of your diet and if you can exercise. By exercise that can just be doing a few extra steps a day, and keeping moving.