Xabi has just taken charge of the team. He played one official match at the CWC. Furthermore, some of the players who played there won't be with the team next year, such as Luka Modrić. Therefore, the Spanish manager will need to analyze the team thoroughly and manage Real Madrid in the best way possible to achieve success in the new year. I'm one of those who think Real Madrid will be successful next year. They can be ahead of Barcelona, but the players need to play with each other and build bonds, and of course, they won't have to waste too many individual chances like last year.
Xabi Alonso still has a lot of time to develop the Real Madrid team and from what happened in the Club World Cup I don't think it can be used as a reference because Xabi Alonso still needs time to adapt and also Xabi Alonso has proven that he is a quality coach when handling Leverkusen so the same thing is also possible for him to repeat again with Real Madrid.
I think it will be difficult, but i believe he will manage to set up the team properly before the start of the season. Some players need to improve their form, and I have no doubt that they will. I'm placing my hopes in Mbappe and believe he will be a key player for the upcoming season. I trust that Xabi Alonso has the solution and that he will manage to win a trophy next season.