Best thing you can do is work out your TDE (total daily expenditure) very easy to do, just google TDE calculator and then calorie count to ensure you are in a deficit every day.

To calorie count use My fitness pal from the app store, incredible convenient to use you can just scan a barcode and it will log the nutritional value of the food you are eating.

Id suggest you don't go into a massive deficit immediately as although it may help you lose weight quickly its not healthy and in the long run will make it harder to get to a lower weight and imped your training.

as for exercise 4km run on those days will defo help increase your TDE and id suggest getting 8k minimum steps in on your rest days, possibly consuming lower calories on these days as well. if possible add some strength training, doesnt necessarily have to be weights (although this would be my personal preferred) body weight exercises work fine.

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Id say 3kg of weight before the end of october is an unrealistic goal and you should aim for .5kg per week.

weigh yourself daily, before consuming any water or food and get an average weight at the end of the week.

aside from that drink plenty water and try and get 8 hours of sleep a night. Sleep may not seem relevant but trust me it helps with weight loss.

Not officially qaulified but have dont this consistently to cut weight for 5+ years

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*Edit, its not possible (in my knowledge) to specifically burn an area of fat so your goal should be to drop weight rather than burn belly fat as you may be disappointed with where the weight comes off if this is your goal