Apple Music: "For You" section not refreshing on iTunes 12.2
In iTunes, open the dropdown menu for your account (to the right of the apple logo at the top of the screen) and select "Choose Artists for You."
On the next screen (floating bubbles of "what you are into"), hit "next" without making any changes.
On the next screen (floating bubbles of "your favorites"), hit done. 


On my Mac, this refreshes the "for you" every time. Pressing the "new" button as suggested by others has no effect on my Mac.