We wouldn't have seen Borussia Dortmund fight to the end if they didn't prioritize the Bundesliga last season, the fact that every team include Dortmund has an above average desire to win the Bundesliga trophy after so long. By winning the league they will find it easier to benefit from various sides such as sponsorship, increase the market value of the players register in it, and so on.
I think Borussia Dortmund really prioritized the Bundesliga last season and this was proven by the number of points they had and the resistance they showed in every game so that their rivals like Bayern Munich also experienced heavy pressure to win the title in the Bundesliga even though in the end Borussia Dortmund also had to lose by goal difference to Bayern Munich in the Bundesliga. This is what I see so Borussia Dortmund are really serious in pursuing the championship in the Bundesliga last season.