I think without De Jong, Chelsea's midfield is already very solid under Jorginho and Kante's control. But if they manage to buy Frenkie De Jong it will make Chelsea stronger. Their chances are bigger than other clubs.
Chelsea must focus on attackers, because that is the position that is now in the spotlight. The centre-forward should be the main target for not relying enough on Sterling and Havertz considering there is some competition played by Chelsea.
You seem to be very in control of the Chelsea line-up. And if Chelsea needs attacking players, it's better for Chelsea not to spend money to buy Frenkie De Jong anymore because there are already other players who are in the same position as Frenkie De Jong. Because Chelsea should be more focused on seeing players in attacking positions so that Chelsea can still save more money on players that are needed, not for players on the same line.
The signing of Frenkie De Jong is going to be a bad one for Chelsea because I do not think he will put any positive impact on the club. Chelsea is negotiating deals to sign players for both sides, including defenders and strikers. Wesley and Aubameyang should be the main focus. Wesley is vital to their current and future defensive lines because they have an aging central defensive line. Deals are good only if they can all be accomplished. It will be interesting to see if Chelsea is going to sign Aubameyang only if FC Barcelona decides to let him go.