Help with flex and WR for championship

My 3 WR right now that’s in my are lineup are Golden Tate, DJ Moore, & Cooper Kupp. I have Robbie Anderson on my bench. Should I pivot to Anderson I’ve one of those guys? Should I also go to waive wire and possibly pick up Anthony Miller to play over them? As for my Flex I have Kenyon Drake day n it right now should I possibly play a WR there or pivot to one of the Minnesota Vikings RB Monday depending n which one plays?
Thanks Foot Clan