I would suggest tweaking where you are and ditching carbs. You and I are the same age, so you most likely got your fill of carbs in your youth and following decades, nothing more to see here, steak, eggs and mushrooms, spare ribs with spicy chicken wings and cheese can compete with the best of the sweet / starchy stuff.
Walking is great, but maybe add some resistance training. This could be just push-ups and squats, progressed over time. I empathise, it will be difficult. Today I had
Brunch
Coconut flakes and desiccated coconut mix, with full fat milk, nuts, berries and sour cream. Followed by 2 air fryed seabass fillets with salt
Dinner
First course 4 local butchers sausages, tomato and onion gravy with broccoli and small amount of swede
Seconds: 4 more sausages
Desert: 3 home made seed crackers with Wensley Dale cheese, some almonds and hazelnuts
This normally results in less than 5 fasting blood glucose and the following. By being consistent and continually pushing (no shop cakes, crisps, no fries, potatoes, bread, rice, cereal, wheat, vegetable oils:
I have had home made low carb cakes, butternut squash fries, coconut flour flatbreads, cauliflour rice, cereal alternative - bruch above. I now focus on protein, for me no carb fall backs are worth it.