Barcelona has what it takes to win the champions League competition last season but facing Inter Milan was the only thing that made them fail to progress to the finals they were still able to win the championship last season ahead of Real Madrid. Barcelona is not having an issue with transfers yet but they are still in financial issues and I think that's what is stopping them from completing some transfer deals. They will be challenging Real Madrid for the league next season they have what it takes and Flick can make it happen for them.
Barcelona were not an exemption for Champions League contenders, they played really well to deserve winning the title. Inter Milan took everyone by surprise when they equalized and took the lead replacing Barcelona in the final against PSG. Next season is still another opportunity for Barcelona to compete in the Champions League, without having signing a new deal Hansi Flick can still make the best use of his players, focus should be more on defense if any things needs to be changed.