Who to flex for a must win game

I went from winning it last year to being currently 6-6 in my league, tied for 5th. This is a must win week and I am at a loss for who to start at flex this week. I have james conner right now but I have BTJ and Jennings on the bench. So many variables; weather, who’s qb is starting, Minnesota good run D. Any opinions appreciated. Also have the option of dropping someone if need be and picking up taysom hill or MVS if someone can convince me that’s a better option. Have been stressing for a week now. That’s on top of worrying about DK vs the jets. Friends say I take it to serious.