The only problem Barcelona faces in bringing in new players is their unsolved financial factor. Players like De Ligt and Kimmich can fill Barcelona shortcomings, but to bring them in Barcelona requires large sums of money. Hansi Flick is an experienced coach and he has also managed big teams like Bayern Munich. Barcelona had to make several changes to their squad, such as selling players who had high sales value to get a certain amount of money to fulfill Flick wishes in building the squad under his care.
The signing of Kimmich should be prioritized because he can play in the defensive midfielder position, De Ligt is not really needed because Barcelona still has a stock of quality defenders. Of course Hansi Flick has to take advantage of the squad that Barcelona currently has if his wishes don't go according to plan, one of the advantages is that Barcelona has many quality young players who can be relied on to fill vacancies in several different positions.
Kimmich will entail more debt because it will be a very expensive transfer for Barcelona. Bayern are not against selling Kimmich and several other players, but their price on the transfer market will be too high, this must be taken into account. Kompany is also ready to release De Licht and Goretzka, if there are teams that are ready to buy them, then Kompany will let them go. But if Kimmich leaves Bayern, his position will need to be covered by someone no less worthy.