If Barcelona cannot get rid of the financial gap, they will have to sell some players. Frankie De Jong may be one of them. Lewandowski can contribute a lot to them, but his economic obligations are too much. The contract price is too high. Maybe they can sell him to Saudi Arabia this year, of course, if Lewandowski wants to. I think they should bring Williams to the team to be better in the Spanish league.
That's Barcelona's problem. They've always found it difficult to get players out and it seems like they're more willing to let their players leave on free transfers than they are to sell their players when it could be a means of making their financial situation better.
It is undeniable that their players also make them strong in terms of performance and can compete for trophies but in the end what Barcelona need now besides trophies is their financial stability.
We can see that last season they were quite difficult to find new players and even for this season there must be donations from fans to bring one player like Nico Williams which of course this is clearly a heartbreaking for a big club. But Barcelona management always thinks that their condition is fine even though if you look at the current situation they seem to be just waiting before they are completely destroyed because of financial mistakes that they cannot solve.