Next season , Mbappe- Vini pair will have to try to perform better. Experienced players like toni kross and Modrich will not be in the midfield. Even then , there are talented players like valverde , Camavinga and Tchouameni. But I am waiting to see Madrid's match strategy next season. Xabi Alonso will definitely apply a new match strategy. And how quickly Madrid players can adapt to the new strategy is a matter of seeing.
The current Real Madrid team looks very fresh.
Only carvajal and maybe Alaba happens to be the two oldest players, and there is a chance of Carvajal leaving next season or two seasons from now, considering the fact that Real Madrid has gotten Arnold as his replacement.
The youthfulness of the team is quite good, at least, they will play together for the next 3-5 years. There are a lot of areas to be worked on, as far as individuality is concerned. The Vinicius - Mbappe click has become a recent challenge, and Alonso seem to have noticed that as well. These players needs to play as a team, and have to stop making themselves star players in every game. The better they work as a team, the stronger they become. That's literally the momentum that Barcelona has been living on and playing with.