Difference between this season and last I that he was able to build up a pretty unassailable lead in the league before the fatigue set in. He did that by using his core team, which had been together the season before & knew each other well.
He's tried to do the same this year with a much changed team, to the results we've seen. So now it's late Feb, we're chasing a CL spot from 6th place with lots of injuries, a fatigued core unit & performances that are patchy at best.