If you want to see your abs—really see your abs, not just slight definition—you need to zero in on what you're putting into your body. Most people focus on finding a nutrition plan that works and stick to it religiously, if not a little obsessively, until it stops working.
But your body needs a wake-up call every once in a while. It needs to be challenged and catered to, just like your muscles. You don’t do the same workout every day and expect constant progress (and if you do, consider this your wake-up call to change that up, too.) Aside from a solid eating routine, you'll need a fresh workout routine too.