It seems that everyone is aware of the difference in Borussia Dortmund's performance in the Bundesliga and in the champions league, yes that is a true thing. They are struggling in the Bundesliga and now they have even slipped from their usual 2nd place to 5th place by quite a distance too. That indicates that this season they have indeed experienced a significant decline which ultimately makes them unable to be in the competition for the title. Last season they almost became champions, I thought they would continue that, but instead they are now experiencing a lot of decline.
I think this is not in line with what Dortmund achieved in the previous season because we know that Dortmund's environment, which always sells its talented players to gain financial gain, cannot make its team continue to maintain the same performance. I don't think it's a new secret and everyone knows, so yes Dortmund will still be a strong team but not with the consistency they have been better from season to season.
Now perhaps Dortmund's target is to reach a place in the top 4 in the Bundesliga because they are no longer able to compete with Leverkusen or Bayern Munich in the standings to win the title. Moreover, Dortmund also managed to reach the last 16 of the Champions League this season, so there are only two things they can focus on this season.