Some talented players sold by Borussia Dortmund, I imagine if they prefer to keep them, then I think they will achieve great success.
Even if they are currently experiencing a very deep decline, I am not surprised by this, because previously I also predicted that something like this could happen at any time. Keep in mind that even though they are very good at finding potential young players, sometimes they are not lucky enough. They can't regret it, what they have to do is change what they have been doing.
That's how Dortmund makes a profit from the process of selling their players and it happened almost every season before. I don't think they can achieve club success in a short time even though most of the young players they don't sell, but if Dortmund keeps these young players in the long term this club should be much better than Bayern Munich because there are many potential players they have but they are not used to achieve club success and instead they only think about the benefits of the player sales process. This season we can see how Dortmund started to lose the competition in the top three positions in the standings and it is much more difficult for them to compete again.