After Messi left Barcelona, Barcelona's performance began to deteriorate. After Koeman became the coach, we saw a further decline in Barcelona's performance. However, Barcelona's performance stabilized somewhat after Xavi took over. And the champions of the previous season were the Barcelona team. However, Barcelona's overall performance is still quite weak and erratic.
Xavi will not be with Barcelona next season. Barcelona must look for a new experienced coach. I don't think Barcelona's performance will improve if the coach is not experienced. Looking forward to seeing who Barcelona appoint as their coach.
Barcelona's performance in several seasons has been very bad, although they can still compete to break into the top 4 in La Liga, but to compete for the championship trophy will be very difficult for them, especially next season Madrid will be stronger with the many transfer plans they will do, for now indeed we cannot hope more for Barcelona but I am quite sure if they will still be able to provide resistance next season in La Liga even though they can't to stop Madrid.
Barcelona's deteriorating performance has nothing to do with Messi in my opinion, because indeed at that time they had major problems in the club's financial balance, forcing Barcelona to release Messi to PSG in order to cut the punishment they would receive if they continued to keep Messi, besides that Barcelona's inability to register new players at that time made Barcelona have to play with makeshift players and that's when Barcelona got worse by having to Cut player salaries and also release all their star players to other teams in order to balance the club's finances.
Xavi decision to leave Barcelona next season will make Barcelona even more depressed because after all it will be difficult for Barcelona to find a replacement for Xavi when their finances are in trouble, Moreover, Barcelona realizes that if they bring in a top coach, of course they will spend a lot of money to pay the coach's expensive salary.