Too many carbs.
Carbs can be simple, aka sugars, or complex, aka carbs.

More carbs than our damaged systems can handle result in high blood glucose numbers.

Meat and fat have no carbs.
Eggs are pretty safe at 1 carb for 2 eggs.
Most whole vegetables are good.

Milk has 1 carb per ounce, whether whole, skim, or lactose free.

White carbs are the worse.
15 carbs is a serving.
Bread - 1 slice
Pasta - 1/3 cup.
Potatoes - 1/3 cup.
Rice - 1/3 cup.
Corn - 1/2 cup.
Peas - 1/2 cup
Beans - 1/2 cup.

Cut out all added sugars in food and drink. Baby steps.

Cut out all white carb and replace with whole grain and high fiber carbs. Baby steps.

Diabetes friendly whole fruits, keep to a serving.
Blueberries, blackberries, raspberries.
Strawberries, avocados, half a peach, half an apple, half a pear, a small mandarin orange, a cup of watermelon.

Baby steps.

Most of my meals look like stir-fry, eggs, soup, salads, or some combination of the above. Baby steps.

Portion control, I plate all my food on a 7 inch plate before eating. Baby steps.

Half plate very low carb vegetables.
Quarter plate protein.
Quarter plate high fiber carbs or a serving of diabetes friendly whole fruits. Baby steps.

I walk 10-15 minutes immediately after eating to slow digestion, and lower the glucose spike. Baby steps.

Start with one thing and keep doing it every day.
When you are ready, do another and keep doing it every day. Baby steps.

Soon you are on your way.
You got this.
Have a wonderful day.