This is what confirms what elders say that you don't know the value of anything until they lose it, that is what Dortmund are facing right now in Bundesliga since they sold Halland to Manchester City and not that it was a free transfer but some cash facilitated that transaction because he is yet to finish his contract, now they are struggling to maintain what they were trying to seize from Bayern Munich to be the winner of the trophies. It may take a while before the coaches may realise his mistakes and by that time, they would probably be going to the Europa Conference League which other underperforming teams always go to at the end of the season.
They lost two best players in two seasons, Sancho to Manchester United and Haaland to Manchester City. Marco Reus got an injury and missed most of first part of season. Only Jude Bellingham is not enough for Dortmund. Moukoko is still a very young player and he needs more time.
It causes problems to Dortmund and affects their performance in Bundesliga. Their problems expand to their defense too with an old defender Hummels. This season can be a failed one for Dortmund because of their problems which are supported by sudden good performances of other clubs. Dortmund will have to play with their best to get a fourth position in Bundesliga at least.
Any position lower than the fourth position will be terrible for Dortmund. They will be separated into pieces and star players including Jude will leave.