Continue using your early game board until you can transition into 4 Ninjas. You can use a unit like Irelia to pair along with Shen once you find him, but a Yone 2 should replace her late game.
Additional comp tips
Make sure to not run multiple Ninjas on the board until you have all four Ninjas. Also, you don't have to run a Chosen Zed, but doing so will greatly increase the chance you 3 star him. The bonus stats on Chosen Zed are also very nice.