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 performance next season.
In my opinion, in addition to buying new players for Manchester United, a lot will also depend on whether Cristiano Ronaldo stays at the club. In recent days, rumors have intensified that Roma and Jose Mourinho personally would like to see Ronaldo in their squad and it seems that Jose asked the bosses to sign the player. Personally, I am quite skeptical about this transfer both in terms of the game and in practical terms, yet Ronaldo is still an expensive player for a club like Roma. Still, I don't see much point for Ronaldo to return to Italy, to a club that doesn't even take part in the Champions League, so dear to Cristiano's heart, this season. In principle, you can just as well play in the Europa League and in the MU. It also seems that Ronaldo's services were offered to Inter, but the club was confused by Ronaldo's high salary, plus the club bet on Lukaku's return.