This season they really need better left wing instead of just Ferran Torres or Ansu Fati, they are not in a stable form so Raphinha and Dembele are the players who often fill that position. Then in the last few matches, Dembele, who had problems with his fitness, had to step aside and made Xavi try to play Gavi in that position. The result is good, Barcelona can still win but I don't think it will be good forever because Gavi is a midfielder. Barcelona also still need a right back because now Bellerin has also been sold to Sporting CP, then they played Kounde there but it would be great if there was a player who occupies his main position.
Ferran Torres, Ansu Fati, or Raphinha may not be experienced enough yet. So they don't play consistently well with the team. And missed a lot of easy opportunities. But they are very talented. They will become experienced if they get a chance to play regularly with the team. And will be able to perform better in the future. I would say it is possible to make these players more experienced by giving them a chance in less important matches.
IMO Barcelona needs to focus more on their defense now. Their defense is still weak. Barcelona needs to strengthen their defense if they want to win the title and continue their performance. If the defense is not strong, it is difficult to perform well against giant teams.