Young players are good, but you understand that it will take a long time for them to get the necessary experience, and Barcelona needs results now. They are trying to attract new players, they decided not to extend Felix's loan because of this, that is, they are doing something. They can also try to apply Real's strategy and attract players with free agent status to the team, for some teams this is also a working strategy. But Barcelona does not have big problems, they have a balanced team that is ready for the new season.
What Barcelona are implementing at the moment is very suitable because they also need much better results than last season and at least Barcelona can win La Liga again next season. So implementing a strategy of bringing in new players and also strengthening the young players that are already there will be a very good option for Barcelona. And from what you say it also makes more sense because Barcelona not only need young players but also need players who already have experience so that the depth of their squad can be quite balanced.
Barcelona already had some, but it seems flick is keen to fully developing his young player in Barcelona. Though Barcelona's squad is young enough, but they have very good capabilities to fight against experienced squad. It's impossible for Barcelona to bring more new players to join in the squad.
The financial issue has been limiting them to explore to get the good composition for the squad. I think the current squad is quite balanced, but they need only to add a new pivot on their wingers.