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Real Madrid's squad is quite strong. I do not think there is any require to change much in this squad. There are many talented players in every position, defense, midfield and attack . So real madrid does not need to add new players to the squad.
Now xabi needs to create a stable match strategy. Only if the match strategy is good , madrid's performance will be consistent. However we still do not know how real madrid will perform next season. However xabi Alonso's first task will be to strengthen Real madrid's defense. Only if Madrid's defense is strong, Madrid's overall performance will be strong.
Defense was Real Madrid weak point last season, and for now, Xabi Alonso will likely focus more on improving that area than anything else. As for midfield and attack, I don't think Xabi Alonso will be too concerned. Real Madrid movement in the summer transfer window has been quite good, and Xabi Alonso job going forward is simply to maximize their potential.
Xabi Alonso main challenge in achieving next season targets will be player injuries. If Real Madrid avoids that, it seems everything will go according to plan. Next season will once again be a season of proving grounds, with a highly qualified squad that should have a much easier time winning trophies.