If we evaluate the last year, then Barcelona should improve the attack, this would greatly help the team in the future.
I think Barcelona has thought about this because they got tickets to the champions league which is putting pressure on Barcelona to get transfers of new players who can give good performance for Barcelona. if compared with last year I think Barcelona has not had any changes and it's still the same it's just that they haven't been able to find a replacement for Messi who was once a leading player at Barcelona.
For the development of Barcelona, last music and this season, it seems that it looks the same and there are no significant changes in terms of playing.
Maybe what you said is true that Barcelona needs several player transfers for next season so they can play in the Champions League even better and especially get the title.
But I'm not sure they will win the Champions League next season.
Messi's departure had a huge impact on Barcelona but they have also tried to get Messi back but the offer they made was still not big enough for Messi so he turned it down.
I think they are much better this season because they are finding that touch again in the game that in the last few years they haven't seen. The arrival of Xavi Hernandez brought that back and made them play well again. But it's true they have to improve a lot if they want to get tough competition in the Champions League, because this season they haven't spoken and are still behind other clubs who do more than them.
They managed to become champions in La Liga, and that was the first step for them to continue to develop in the following seasons. By making some changes and giving a little touch they can be even better.