I was 73.10kg 4 months ago now I'm 64kg, trying to look slim for a holiday and lifestyle change, what else shall I do to get slim?

Do I need to do extra workouts? Or can you rely solely on cardio to burn your fat?

Say if I got down to 54kg which is my goal, would I then have a flat stomach?
I was 73.10kg 4 months ago now I'm 64kg, trying to look slim for a holiday and lifestyle change, what else shall I do to get slim?
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