When it comes to ab hypertrophy, start adding weight or resistance to your exercises. Increase the difficulty of the lifts the same way you would with any other body part to give it new stimulation. You wouldn't expect your legs to grow if all you did was bodyweight squats, so you can't expect your abs to grow from doing a few crunches. You'll progress by changing up your routine and making it more challenging. Try using bands because you have more options for the level of resistance and it's easier to hit different angles. Banded lying knee raises are one of my favorites. The bands can be around your feet or knees. – Bronwen Blunt

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