Carlo Ancelotti is one of the best coaches, he has given many trophies when he was the coach of Real Madrid but what happened last season was beyond his control such as many injured players which made the team's performance decline drastically, I think that's normal for a team that is experiencing a bad season.
And on the other hand, Barcelona must also be recognized, after changing coaches and making some changes they have improved a lot, despite Real Madrid's slump last season but Barcelona is indeed very strong and that should be recognized.
And I think for next season everything will be different, Real Madrid has also improved and we should forget what happened last season, the competition will be fierce again next season and I'm pretty sure it will be fiercer and more difficult.
If coaches had their way I believe that some would look for a spell that would make their key players remain fit all through the season but it's something beyond their power cause a team especially big team with many schedules would definitely suffer injury crisis, someone like Pep suffered it too when Rodri had a long-term injury, it disorganized the defense for a while and it took Pep a while to discover how to recover from the absence of Rodri. Well, talking about change of manager Real Madrid have signed one of the best coaches in modern football and there would be improvements, they've already signed several good players to help the new coach succeed.