Be more serious if you want to achieve your goal. Do more reading, and do learn what the purposes of doing the unknown weight-lifting move of yours.

And try to achieve 1000 crunches per day, that will helps a lot to burn fats on the front side of belly but that will leads to 6-paxs and spare tires 

You didn't smell the sarcasm? Your focus on crunches and sit up simply show that you are still doing spot-reduction.
Before you focus on exercise, you must learn to eat right. Your diet does not have sufficient nutrition.