Real Madrid tends to expect their coach to be able to win titles every season and they also expect the coach to keep his team performing well throughout the season. This season Real Madrid failed to win several important titles, including La Liga and the Champions League. The Coppa Del Rey is a different title, but it is also the most important part for the coach to stay at Real Madrid in the long term.
The pressure will always be on the coach's side when the club asks the coach to win the title every season, this request cannot always be fulfilled by coaches in the modern football era. The increasingly fierce competition makes it more and more difficult for coaches to meet club management's expectations, coaches will be considered a failure when they are unable to present a trophy at the end of the season.
Zidane once felt how difficult it was to coach Real Madrid, even though he had won many prestigious titles, he was able to break the record for winning the Champions League three times in a row. When he failed to meet management's expectations the following season he was immediately deemed a failure and the club immediately looked for another coach. Ancelotti cannot give a guarantee of being able to present a prestigious trophy every season, ups and downs in a club's performance always happen every season. Accepting an offer from Brazil was the best decision for Ancelotti, especially since so far he has won almost all trophies at club level, maybe it's time for him to win a trophy at international level.