This may be the worst coached game I have seen in an NBA Finals.
He is letting Phoenix run the same pick and roll on his big every time. This leaves the Bucks two options: leave Lopez on the perimeter covering Paul or Booker, or pull Lopez, a tremendous offensive player, off the court. My personal choice would be to switch with everyone but Lopez, but basically anything else but Lopez covering Booker or Paul in space is a win. Trap on the screen, play a zone, literally anything would be better than what Budenholzer is doing on defense.
On offense, it has been one and one isolation basketball the whole game. Lots of low percentage shots. Also, Bucks should pick and roll with Lopez and then have him post up or get the ball on the roll vs a guard down low.
This isn't that hard, and most high school coaches would adjust better than Budenholzer. He is in way over his head.