I wouldn't say that Barcelona's performance was good last season. Only Barcelona and Real Madrid compete for the La Liga title. Other groups lag far behind these two groups. However, Girona's excellent performance last season surprised us all.
However, Barcelona need a stronger squad if they want to dominate La Liga next season. Currently, if you compare the teams between Madrid and Barca, Barcelona will be far behind. I look forward to seeing what steps Flick takes to strengthen this team. Hansi Flick is a very experienced coach.
I can’t deny that Barcelona did not perform well last season. But the way you said it is like Barcelona performance was very poor, which is not, although I can’t argue that Girona did well in their matches until they faced a defeat from Real Madrid and their performance started declining, and from then Barcelona took the place, so to me, Barcelona performance was not that bad last season; they came to the top 2 of the table, which is not a bad result for them.
I think they just need to get new talented players that can give them what the team wants because some of the Barcelona players are weak and they need replacements before the next season kicks off; if not, they will face hard times in their squad.