Hansi Flick may bring many changes to Barcelona next season, but this will not mean that Barcelona will be able to easily compete with Madrid, barcelona deteriorating financial condition is of course the reason that Hansi Flick will not be able to optimize his ambitions with Barcelona, so I think next season we won't see many differences in the competition between Barcelona and Madrid compared to last season, so it is very likely that Barcelona will only try to compete as title contenders but not as title winners in end season.
If Hansi Flick really needs some new players to be recruited, Barcelona management could actually sell Yamal to PSG for a high price, but it seems that Yamal will continue to play for Barcelona. I think Hansi Flick has another strategy to compete and play with the main squad. currently available and developing young players to fill the main squad in the new season, but I'm sure everything needs a long process, Hansi Flick needs time to adapt to the players so they can know their respective playing characteristics so they can be placed in the best position. I'm also still not sure that Barcelona can win the Laliga trophy next season.