Overtime as the players get older, I think the best strategy is to look at the aging players.
KDB and Gundogan both play centrally, while we have Mahrez on the RW.
I think the best strategy here considering how we kind of play 442-ish very recently, is to go for another central attacking player (not quite a striker though), and then simply promote Borges and Mebude in as wingers to further free up Foden for more central time as well.
The great thing about having these two young wingers, is it means we just need one signing overtime to have great depth.
Two Great Options Imo (Both Bundesliga, because we don't miss when we sign from that league):
1. If we want more of a second striker, Chirstopher Nkunku is the best option. Could play with Haaland or Alvarez comfortably, and ideally plays off another player.
2. If we want more #10 like KdB to pair with the striker, we could try to shift Foden there more, but I think he still needs to be played on the wings if Mahrez leaves. I think Florian Wirtz is going to be star for Germany as a playmaker.