Dedicated lower stomach workouts

I see alot of flat stomachs here..I have been trying to ose that lower belly fat for...18yrs now..I do ab crunch machine at the gym 2wice a week and hanging leg raises intermittently throughout the week...my current diet consists of ground turkey and mixed vegetables 3 times a day and 2 to 3 gallons of water. Mixed peanuts with dried Cranberry and mangos are lightly consumed..what am I doing wrong or missing here? I still feel put of shape 😭😭😭