I agree with you, it is very embarrassing that Barcelona fans are raising funds for the team to buy the players they need to be stronger for the next season, this does not seem right to me because Barcelona is a top club, and Barcelona is one of the clubs with the most trophies among the top five leagues in Europe, so how is it difficult for them to the point where their fans are raising funds to purchase important players? It is strange. Barcelona must avoid this embarrassing situation by getting the necessary players before the start of the next season.
Barcelona will be unable to compete next season if Olmo and Nico Williams are not signed, they cannot rely on Yamal to be fit and play all of the season's games, there should be time for him to rest because they are also are human, he cannot be in good form while playing in different competitions, yet there is no one to fill his position. Many fans will be happy if Barcelona signs these players since their rivalry with Real Madrid will be more strong in La Liga.
I agree with your words that Barcelona cannot compete with Real Madrid next season if they don't recruit Olmo and Nico Williams, as we saw the performance of Olmo and Nico Williams with Spain at the Euros yesterday, these two players can really make a huge contribution so it's possible they can also do the same thing against Barcelona.
And regarding Barcelona's current financial decline so it is difficult to recruit these two players, I think there will be a common ground because Barcelona has several players who are still expensive on the market, so they can still use this to get fresh money to realize Olmo's transfer and Nico Williams.