I think its as easy as defending without fouling. We haven't experienced foul trouble yet, and I hate to play into the trope, but my fear is Oweh, Butler and Williams getting in foul trouble early and clipping our wings that have allowed us to fly high so early on. If we can defend hard but smart and avoid foul troubles, and hit a solid clip from deep, we are tough to beat.
I dont know how we defend flag as he's a match up nightmare for us. Someone we'd typically put a Thiero type player on, but we have none of those. I almost feel like putting Oweh on him and harassing him to put his ball handling to the test and forcing him to be a jump shooter. Or we let Carr just do his best and shut down the other 4 on the court and just accept Flagg will get his.