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.
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managing a player's ego isn't easy, it's quite difficult, and not all coaches are capable of managing their players' egos. moreover, real madrid's attack line is filled with star players-- and there's also a slight discrepancy between vini and real madrid regarding his salary, which he considers unsuitable. there are also indications that vini feels jealous or uncomfortable with mbappe's arrival. so, xabi alonso must address these issues because they have a significant impact on their attack line.