At risk is a wake up call that you should make some life style changes that will reduce your blood glucose level. It is a good idea to find out what actual HbA1C level you are as that will indicate how much you need to do, the range is between 42 and 47mmol/mol, over that will give you a diabetes diagnosis. A second blood test is often done if you are on the cusp.
The main thing you can do is reduce your intake of the foods that are the highest carbohydrate by cutting out cakes, biscuits and sugary drinks including fruit juice and reducing portion size of starchy foods like potatoes, rice, pasta, bread and breakfast cereals and some fruits like tropical ones.
Basing meals on meat, fish, eggs, dairy with vegetables and fruits like berries with small portions of any high carb foods.
This link may help you with some ideas for meals and food substitutes.
https://lowcarbfreshwell.co.uk/
Some modest changes are probably all that is needed but it is better to do that gradually especially if your diet has been very carb heavy as it will minimise the risk of issues with your eyes and nerves as your body adapts.
If you are going to go down a low carb route than it is suggested that no more than 130g per day TOTAL carbs not just sugar is a good starting point. It does not mean NO carbs.
Losing weight if you need to and increasing exercise if you can all helps.
Welcome to the forum I forgot to say.