Primarily, you simply need to eat less calories than you consume, but I'm sure you are already doing that. Either upping your exercise or decreasing your intake.
Second, work your core with stabilizing exercises, like planks (lots of variations), suitcase walks, woodchoppers, etc. Things that focus on keeping your core stationary and supporting, as is their job. Don't worry about "abs pushing out your fat" because as you lose weight by shedding that fat, you'll have some decent core muscles underneath ready to emerge.
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