Maybe you are talking about Dortmund players being sold and you think the bad results in this team are related to this and since Dortmund selling players they can never have good performances in the Bundesliga games. But the fact about Dortmund is that's not something new about this team and they have been putting the superstar players for sale for a long time, that's how their business works in this team.
Not having players like Erling Haaland and Jude Bellingham was definitely effective in Dortmund but that's now something new and I think the main problem for them was about their coach because since they started working with Nuri Sahin. Now since they got their coach fired maybe we can hope to see better results from this team if they get a better coach in Dortmund.
I also think like you. Dortmund never had a problem with the business of selling their talented players for the club's benefit. This is normal in big clubs too.
The current problem is focused on the performance of the coach who is not as expected so the most appropriate decision and guide for Dortmund is to find the right coach.
Let's see who will be the coach of Dortmund. Several names have been rumored, but maybe they haven't got the best one yet.