Bayern Munich's dominance is very difficult to break. Because there are no more rich clubs like Bayern Munich in the Bundesliga. Dortmund and Union Berlin played well last season, but they are not as rich as Bayern Munich. Even so, I would say that Dortmund has the ability to break Bayern Munich's dominance.
If we look at last season, actually Bayern Munich was also a little lucky. Bayern Munich made a mistake and Dortmund did too. I think opportunities are still quite open for other teams. Dortumund, Leipzig, Union Berlin have equal opportunities. Although it doesn't many big transfers were made by them. They can always make things difficult for Bayern Munich.