What to do about Ertz?

10 team PPR; 7-1 record

I have Ertz and Waller. Should I package Ertz in a 2 for 1 and try to upgrade at another position? Or hold onto him for his playoff schedule? (NYG, @WSH, DAL)

QB: Kyler
RB: Saquon, Carson, Mack, D-Monty, Latavius, Ty Johnson, Walton
WR: Adams, Julio, Tyreek, Godwin, Gallup

I’d probably just hold him as insurance. I’m not sure how much you’re effectively going to be able to upgrade any position from where you are at