Even though they have a lot of great players and managed to become La Liga champions last season, they still don't have a guarantee that they will win again next season. Next season's matches have not yet started even though there is a lot of talk about Real Madrid winning again and it will be done on a regular basis. It's easy, considering that the players Real Madrid has are world-class star players.
Indeed, it's not a guarantee because in football sometimes the results can be unexpected and surprising, although it cannot be denied that Real Madrid has almost perfect strength within the club so the opportunity to win another title is still wide open and Real Madrid has a bigger chance, so of making other clubs in La Liga, they are worried about Real Madrid's performance next season, which is full of great players and there is no end to it. Real Madrid still wants to recruit players from Bayern Munich, but if Bayern Munich charges high prices for its players, I don't think Real Madrid will recruit the players.
Like when Real Madrid wanted Mbappe from PSG but PSG priced the player quite expensively so Real Madrid didn't sign the player but in the end Real Madrid could have the player for next season without even spending a penny to bring this player to the club so Real Madrid always his own way and every player definitely wants to join Real Madrid even though their current club is making things difficult for them.