1) Exercise. Maintain a high intensity for your workouts. Many
articles out there that can recommend such workouts. I personally
only do supersets. The aim is to increase and maintain your
metabolic rate to be constantly burning calories even when your
body is at rest.
2) Diet. Watch your calories. Apps like MyFitnessPal can monitor
your daily calorific intake.There are also many websites that can
help you calculate your daily required calories based on your
lifestyle and age. Eat healthy.
3) Strengthen your core. Exercises like crunches and planks are
basics. You need to maintain your posture during walking and
sitting as well to strengthen the core.
4) Get a full length mirror. Stare at your body whenever you
have time. You will become your own critic and make sure you stay
disciplined.
5) Get clothes that you want to fit into that will showcase your
abs. Stick to your goals. Your body is your dedication and hard
work. Flaunt it.
Stay focused and stay healthy. Good luck!