Summer transfers IMO, if players are playing more or else the same for the whole season:-
Midfield -
Sell FDJ - We get a bit of money minus his wages.
Buy Kimmich - Free transfer, will earn less than Fdj, and is almost a similar replacement.
RB -
Kounde is top-class. I don't know why the forum shits on him, he's at least a top 5 RB currently.
Kimmich as an excellent backup. Two birds one stone, no transfer fees needed. Fort can stay as a third option.
CB -
Sell Christensen - Good player, but very injury-prone. His contribution to the CDM spot is not needed anymore by the team.
Buy Tah - Free, not an upgrade, but a sidegrade and better availability with rotations.
Kounde - with Kimmich on the team, Kounde can be played as a CB while Kimmich as an RB.
Renew Inigo - Has been playing phonemal for now. Araujo, Cubarsi, and Inigo gives us good enough defense for a top team.
With Garcia, we will have 6 players for 2 spots, that should be good enough depth for rotations
LB -
We need a better player than Balde. With how Flick uses the LB position we need a better attacking player. Some suggestions were given here, I can't say who should be the priority.
Buy Davies - Free, maybe hard to get because of the Madrid link, and might ask for a lot of money. He is not very good at defense, but he was the best under Flick, and maybe that might work.
Striker -
I don't believe Lewa will be performing the same come April. But will see about that.
A sensible option would be a player who can both play LW and ST. And not a high-profile one, so he can be used as a rotation player for 2025.
Sell Tuna - Get any fees doesn't matter, his wages are off the books so that's a bonus.
My dream scenario - We get a World class number 9, selling Tuna and FDJ will give us enough salary headroom to keep a player of that profile for a year where Lewa might still get more minutes. Maybe not feasible, but one can dream.
Keep Fati around, but will lower wages. He seems to be good enough as a rotation on LW.