losing any fat at all starts with nutrition. You need to write a diary of everything you eat in a day and count the calories.

Then work out your Basal Metabolic Rate (BMR) and your Total Daily Energy Expenditure (TDEE) you can find calculators on google.

Make sure you always eat above your BMR calories as this is the MINIMUM amount of calories your body needs in a day. I tend to find a sweet spot between BMR calories and TDEE calories. always eat under your TDEE calories.

Mix all of that with the exercise you have been doing. Maybe increase the walking pace or try walking the a route that is mainly uphill and you should see losses.

Bear in mind, belly fat is incredibly hard to lose. It takes a lot of hard work and dedication. I'm still struggling with it myself but I'm making progress.

Keep it up Bro!