I think it's high time Borussia Dortmund's management comes to terms with the fact that football success isn't measured by strategic a club can be by signing young promising and talented players, develop them and sell them to clubs with higher financial strength including their local rivals Bayern Munich.
Rather football success is measured by the number of trophies that's won by a club. Dortmund must learn how to keep these players they develop, grow them in to a formidable team that'll be very competitive not just in Germany but also in Europe.
Dortmund just do business in every transfer window with the finances they get. But yes, it will continue to make them fail in the competition for trophies because they always sell their key players to other teams in the transfer window. If Dortmund can change their pattern in the transfer window for sure they will be stronger now because they had Haaland before and Bellingham but these two players have joined other teams.
If you look at the developments that have occurred in Dortmund, of course they always manage to orbit talented players in every season. But yes Dortmund always accept the offers that come to their players because they are looking for profits in player transfers. On the other hand it is true that the benchmark for a team is their achievement in winning trophies and bayern munich is currently the most successful team in the Bundesliga.