That defeat should not be what will motivate them or make them to get all the players Liverpool has, they should forget about that defeat it won't help in any way but the manager should think of how to manage the player to be playing as a unit not like what some of the players like Mbappe and Vinicius Jr are doing. When ever they lose the ball they hardly track back which causes more damage to the defenders so I feel getting more players is not going to help, hope you saw how they played against PSG with a low defending style, if it continues this way is going to be a problem for Madrid.
They need new defenders not midfielders because is like moving in circles, imagine Real Madrid playing a good defender (Valverde) as a right back, that will kill the way they play and oppositions will get the best of them because some of these players can't play better in positions they are not good at.