Despite Barcelona's good form in the previous season I still have a feeling that it will be very difficult for them to win the Champions League, I think they will reach the semi-finals at most. It's like they're not ready for it anyway, it's hard to explain it. Nevertheless, we will have to see how they start their season in general, and the group stage in particular is worth paying attention to
I agree with your opinion but an experienced team like Barcelona can surprise you at any time especially if they manage to maintain their top form next season. Xavi has managed his team and players very well, it has motivated all players to work optimally for the benefit of the team.
I believe Barcelona have less chance than Manchester City, Real Madrid, Bayern Munich and or maybe PSG, but Xavi has quality and he also has good squad depth to look forward to. Of course I can't fully expect Barcelona to appear in the Champions League final next season and win the title, but nothing is impossible.
The teams that will play in the champions league for this season are the strongest teams in their respective leagues. Indeed, Barcelona is believed to be able to provide stronger competition after their squad depth is strong enough. With the confidence of the players after winning the Laliga trophy last season, they will be even more motivated to make a better run in the champions league this season.
De Jong, Gundogan and Lewandowski will be at the heart of the game in their depth of strength next season. So that other teams should be wary of Barcelona rise this season. For Manchester City or Real Madrid they are still the strongest team in the Champions League this season and they will be a big calculation for the opponents they will face this season.