There is lack of transfer activities in Manchester United. They don't look like they are under pressure to making a signing. De Jong is the only big player Manchester United have targeted, they have been lacking creativity in that position and that's what De Jong is bringing to the table. He's a fantastic player exactly what Manchester United needs at this time
Man United actually has a big squad, they have many players in any position. They only need a change in the midfield line, they need a replacement for Pogba. So, they focus to sign Frenkie De Jong as the main target in this transfer window. I think Ten Hag feels satisfied with his current squad, he doesn't want to have many new players. I don't know whether this decision is the best way or not, let's see what Man United perfromance next season.