Wondering how Dortmund is going to perform in the next season because they had their own policy to sell the players for years that's how they usually earn money. This business helped them to earn money by selling players like Haaland to Manchester City and now other players Jude Bellingham to Real Madrid while we know if Dortmund had both players in this season, by using a player like Haaland they could have much more chance to achieve the Bundesliga title, but they prefer to earn more money instead of this.
I don't think there is matter of worry about Borussia Dortmund future because mostly they make their way for the having better results into Bundesliga which is their trading, and they never try to won trophies because this is not in their target now they already sold their best player for this season Jude Bellingham to Real Madrid which bring good profit for them and now their agents are working on for having few youngster which will do good work for them in this season, and they will be able to have youngster in their squad which will helps them for development and then have again huge profit.
Lewandowski, Haaland and now Bellingham all are bought for this purpose with now having their life impressive into their dream clubs, hopefully things will be gone as like this for them, and they will collect huge funds with this way as well.