Menu Depth

[Isolatedcards]

Looking for feedback on how to make this look cleaner. I have my 1st level menu but when I arrive at the 2nd page it's a long list so is level 3. Can you show me some examples of how to make this look better! 

Level 1 - https://isolatedcards.com/

Level 2 - https://isolatedcards.com/pages/hockey

Level 3 - https://isolatedcards.com/pages/hockey-1991-92

[Isolatedcards]

Anyone?