it's not a big problem for Real Madrid not to be champions in La Liga but Madrid are already proud to be champions in the Copa del Rey and the second target is to win the title in the UCL. so it's not because Madrid is inconsistent or experiencing ups and downs in La Liga but Ancelotti saves all the best players and the energy of his players to be released in the main league to get a trophy that makes all Real Madrid supporters proud.
on the other hand there is no need for player transfers because with the current players Real Madrid already has a very strong performance even Ancelotti is the best coach that Real Madrid has to keep.
it is true that real madrid has one of the weak factors in Laliga, including their lack of concentration in several matches which made their hopes vanish in the race for the Laliga title. But on other things they were quite consistent where they were able to make their run quite consistent in the Champions league and real madrid were successful in the copa del rey as well as in the club world cup. On the one hand, I would judge that Real Madrid performance in Laliga was not good because in several matches they were not supported by a number of players due to injuries and the mentality of the players who were tired due to being accompanied by a busy schedule.
However, this will not have a big enough effect on the champions league, they are able to play well enough in the first leg, but when the advantage cannot be maintained until the end of the match, it is quite regrettable.