Should I trade for a WR1?

Hi guys as the title says I am trying out figure out my move on any WR1.
I am pretty much set in RB, but I dont know which one to trade and what player to target really so advice would be appriciated. 10-League 0.5 ppr.

My Team:
David Johnson
Dalvin Cook
Kerryon Johnson
Stefon Diggs
Chris Godwin
Delanie Walker

Bench:
Jaylen Samuels
Justice Hill
Miles Sanders
Tyler Boyd
Cooper Kupp
Curtis Samuel

So the first Question is should I trade for a WR1 and second WHO should I Over ?