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He helped Barcelona a lot, but because of some undesirable problems such as injuries that befell him, it made him miss several matches and that made him unable to help Barcelona optimally. But I can't blame him, because injuries experienced by players are actually things that the players themselves don't want, but no one can know when it will happen to them.
If Barcelona wants to sell Frenki De Jong then they can take advantage of it by setting a high price. Especially if there are several teams that are very interested in bringing him in, such as Manchester United, who have actually heard the news that they are interested in De Jong for a long time, but Barcelona are keeping him. Now is an opportunity for Manchester United if they are still interested in this player, but they also have to move quickly because they are not the only ones interested in the player, there are still several big teams who are also eyeing him.
De Jong has been an important Barcelona player since being brought in from Ajax Amsterdam, he has also always been able to maintain his performance which makes his position in the Barcelona squad difficult to replace. Injury is something that no player ever wants, he has gone through difficult times when he was injured but was always able to perform optimally after returning to the Barcelona squad. De Jong has a high buyout clause in his contract, Barcelona can take advantage of the interest of other clubs to bring him in to increase the club's income.
His departure did not really affect Barcelona midfield because they already had other players who could protect the midfield area well. Barcelona can take advantage of Manchester United interest to get some money, they certainly really need other players after the change of coach. De Jong departure could also save Barcelona expenses because he has a bigger salary than other players.