Need to Win out to make the playoffs

Need help choosing 2 RB and 1 WR (3WR) I leaning towards Mack, Williams, Mixon. But not sure if i want to switch in singletary against the dolphins. And with Sanders maybe missing this week im not sure with DeeDee or Pascal. also trying to pick up Marquis brown on waivers.

Current Roster:

RB - Marlon Mack, Damien Williams, Joe Mixon, Matt Brieda, Devin Singletary, Miles Sanders, Darrius Guice
WR - Cooper Kupp, Emmanuel Sanders, Terry Mclaurin, DeeDee Westrbrook, Zac Pascal