Dortmund will only be in the top four next season, but there's little belief that Dortmund might finish second next season if other teams don't perform significantly better. Since there aren't many teams in the Bundesliga with the same strength as Bayern Munich, Dortmund could have a chance to finish second next season. However, teams like Leipzig and several others could pose serious obstacles for Dortmund and Bayern Munich next season.
Dortmund, Leverkusen, and Leipzig will likely be the top contenders after Bayern Munich. There won't be many surprises. I think those four teams will compete fiercely, but Munich's dominance will certainly continue. I haven't been following the Bundesliga transfer window closely. However, I noticed that Leverkusen has lost the most key players. So I think Leverkusen will struggle under Ten Hag. But this is just a statistical analysis; the ball is round, so there could still be plenty of surprises.
Seeing the strength of the team I am a little doubtful that the team will be able to put pressure on Bayern Munich especially Leipzig and Leverkusen who did not make major changes to become better, Leipzig did not make many changes and Leverkusen made a lot of changes so I think it is very likely that these two teams will not be better than last season so Bayern Munich next season is very dominant in my opinion and most likely they will defend the title easily.