I also noticed that condition with Barcelona in the Champions League last season, but one of the other factors that made them fail was that Barcelona joined the group of hell last season. Regarding the Champions League next season, of course Barcelona has a higher chance of qualifying for the round of 16 (at least), but it still depends on who will be their opponent in the group stage. If Barcelona are going to be in the group of hell again, I think it's difficult to see them qualify for the higher stages.
About Barcelona, I know they have changed. Xavi is responsible for improving the quality of Barcelona in the last 2 seasons, but I agree that Xavi has not been able to convince many of his fans about the Champions League at the moment. Dembele will join PSG and a verbal agreement has been reached, it will cost Barcelona their firepower next season.
Not the hell group for Barcelona in the previous season in the Champions League, but indeed their strength is not too strong when they have to face other teams. Barcelona was very difficult to win matches in the champions league last season because they were not consistent in the matches they played. However, this season Barcelona will try their best after the player's confidence begins to rise after winning the Laliga trophy.
For Xavi, he really wants to bring Barcelona to go far in the Champions League so he needs better performance from his players when playing in Champions League matches. I'm sure Gundogan presence will be a source of strength for them next season because Gundogan can provide his best experience to help Barcelona beat their opponents next season.