To be able to more easy change the height of the waves I added a constant value and connected it to the gain on both fractals.

Between the Constant and the second fractal I added an math function multiplying with 0.1 as I mainly want the big waves to be effected.

Also added a constant controll to the X,Y and Z values of the firs fractal so I more easy can modify the width, length of the waves.

And then I added a water material.