Barcelona won this league and this can be a great achievement for Xavi and his players especially when we know Xavi won the season while didn't have a good financial situation compared to Real Madrid. Barcelona also failed to hire Messi, I think Barcelona will have problems for the next season because they don't have enough good players and they need to hire many players at least they need to hire a forward to have a young alternative for Lewandowski.
Barcelona has just started a new era and they have to be more prepared for next season. The results of this season have been fantastic and they have achieved it with the hard work they have put in. I don't think that if Barcelona fail to send Messi home, it will make them not strong next season, on the contrary, Xavi can bring in other forwards at a young age and can be projected for the next few seasons. As the transfer window opens, we all witness Xavi's move to sign several players to strengthen the squad for next season.
Yes, forwards are one of the things that Xavi will focus on because he needs players of good quality at a young age who can help them for next season in the Champions League or Laliga.