I think, Barcelona will soon loose their peace to sign in more potential players that will help them to maintain that first position in the la Liga league competition next season, so that their coach will experience another honor from the fans again. If Barcelona coach can release money to bring Kylian Mbappe in this summer, I think, Real Madrid or other strong teams will not challenge Barcelona next season because their defensive and midfield is very strong for their strikers to achieve many goals in this season. Since Karim Benzema has left Real Madrid to another team and kylian Mbappe manager is not willing to release him to Real Madrid, show that Real Madrid will still face the Same challenges they experienced last season.
I would not dream that Kylian Mbappe would become a Barcelona player when Barcelona are not in good financial condition. Barcelona can defend their title next season regardless of whether they are not as good as other teams in terms of transfer activity, but I believe Barcelona still has the quality that can be expected.
Xavi can adapt the right strategy to the depth of the squad he has, but of course he will have to work hard to defend the title with the few players he has. Barcelona proved that last season, but I won't guarantee Barcelona can do the same next season.