It takes a long time and it takes a lot of money if you really want something like this to happen, we know that Dortmund always have some talented players but it's not enough because there has to be someone who is really experienced there and when it's wanted the higher ups always let the player go with big sales money so I personally don't really feel that something like adopting a style will be done because they must be aware that the risk of loss is quite a lot if they intend to compete even though at this time they are often said to be rivals.
Dortmund often prints a lot of good players and has a lot of money, but if they want to buy new players again, it seems they will do it when the transfer market opens, so far they have not provided any information about their new players and there have been no rumors circulating. Dortmund have lost again in their last 2 matches and this is very sad because they should have stayed in the top three of the standings.
Of course they will do that, right now their problem is still the same with the absence of a striker there especially with the absence of Haller who is projected to replace Haaland, of course Haller is currently still in the recovery stage, it is clear they will still be looking for an attacker in my opinion.
At the moment there is Anthony Modeste but I think they will still be looking for one more and of course they will also be looking for a midfield player especially if Jude leaves this will also be empty and needs to be patched up.