What do I do with Joe Mixon?

Starters WR
Michael Thomas
Chris Godwin

Starters RB
Dalvin Cook

JOE MIXON IS MY current flex for week 3

Bench RB

Bench WR
D. Robinson
A. Jeffrey

Should I trade him?
Bench him? For a WR FLEX?
Start him?

My opponent has Patrick Mahomes. Should I start D.Robinson over Mixon?

Please help

RB1 over WR3/4 for sure. Mixon wins, he should be healed up good,

Please respond to my question.,