You cannot pattern a pattern. What you can do is to modify your first Sketch to create a full ring rather than a portion of it. Then, delete the PolarPattern, convert your LinearPattern into a PartDesign MultiTransform
(right-click on the LinearPattern) and add a new Polar Pattern to it. Then prepare to wait: PD transformation features are slow...
An alternative is to make a Draft Array
of the Body. It will be much faster. Remember to change its Fuse property to "true". See the end of my reply here
for the reason.