There are only a few managers who can unite the egos of star players, maximize their potential, and achieve long term success. Real Madrid has star players in almost every position, and it's not an easy job to make them play collectively. Therefore, Xabi Alonso will certainly need to take a different approach in managing each of his star players so they can work well together. Of course, having many star players can sometimes only attract a lot of attention, not necessarily bring instant success.
Looking at the current conditions, I think Xabi only needs to really focus on improving Madrid's attack line, especially in terms of ego, because for the midfield or defense they can still be controlled but for the attack line, especially for Mbappe and Vini, it is clearly not an easy job.
Both of them have almost the same level of ego especially with the position that is actually the same for Vini and Mbappe clearly this is also a difficult job for Xabi to be able to create good chemistry for these two players.
But if in the end he succeeds in getting them to put their egos aside and switch to a collective game then I think Madrid will really be very well protected in terms of goal productivity because indeed these two players are very solid individually but quite bad when placed together in one club so far.
Last season was a nightmare for Real Madrid because they lost all their matches to Barcelona. It may have never happened before that Real Madrid lost all their El Clasico matches in a season. Just like they lost the El Clasico match, they also failed to perform well in big tournaments like the Champions League, Club World Cup and other tournaments. The star players of the team, especially those who play in the strike position, cannot be blamed much for Madrid's poor performance because Real Madrid has been playing with a shaky defense line-up from the beginning. If Real Madrid really wants to change their performance and do well in all competitions next season, then they need to improve their defense position a lot. Maybe it is a lot of pressure for the manager, but the manager has to accept this pressure and make the team a top performing team again.