Xavi was a very smart football player and I see now he is a very smart manager. It couldn't have been easy to rally Barcelona, they did it. How did Barcelona get to second place in the league? It happened because Xavi motivated the players with his smart strategies. Now in the summer, I'm sure he will find the best players and put them in the Barcelona jersey.
There is an opinion that the Tiki Taka strategy is outdated and of course it has a certain result, but not above a certain level - roughly speaking, in modern football you cannot claim titles using this strategy. In addition to the coaching problem, Barcelona still have financial problems - I have not heard any news that would say that they were able to somehow settle their huge debt.