Levy is far from being perfect, but he gave conte what he could I think. Bentancur, Kulusevski, Richarlison, Perisic and Bissouma are all first team players and I think Conte could have used them far better than he's doing. He should rotate more the squad, there's no doubt about that.
I don't think the problem are his tactics to be honest, think he has a lot of problems but maybe the tactics aren't the major problem. In my opinion the players are overtraining and overused, and we know that as we ealready saw Conte's training sessions. You can see the low intensity we play, the fatigue in players like Kane and Son, we are running out of battery by now.
I know there are other problems but I would like to point this one as it seems very obvious for me.