Exactly, Bayern Munich has a big challenge this season that cannot be underestimated. Leverkusen and Dortmund, at least those two clubs will be their tough competitors.
Especially if we look at the last match Bayern Munich vs Wolfsburg, even though they won, their game was not effective and accurate enough.
Check these statistics:

Google/bundesliga-wolfsburg-vs-bayern-munich
They have 71% ball possession, but only 8 shots on target, and only 2 goals created + 1 OG
Trying t think Leverkusen and Dortmund will perform any lesser than they had done in months most recent times would be a very dangerous underestimation which may be a huge problem to Bayern Munich and I believe Bayern Munich are never going to do such because they know for sure that these guys have go their eyes on the trophy and aren't going to stop trying for any reason until they are able to get to win the trophy. Bayern Munich has got a whole lot to tackle at this point especially trying to get their stance with their new coach who's still figuring it out around the bundesliga. Against Wolfsburg they did tried but that performance isn't the type they will go against bigger teams with, even with them having the most possession, they still were able to show the perfect dominance by the score line.
Bayern Munich actually only needs to find the key that has been lost or in other words the new coach must find a way to restore Bayern Munich's consistency.
With high consistency, Bayern Munich will certainly regain the dominance that was lost last season, although it is currently more difficult because Leverkusen is on the list of clubs challenging Bayern Munich, but if Vincent Kompany succeeds in finding the right strategy, I am sure Bayern Munich will succeed in getting the title this season.
Vincent Kompany only has to continue to pay attention to every problem that occurs, including the weakness of the midfielders and the defense that must always be changed so that consistency is maintained.
I also think that too many mistakes are made in the defense. A team like Bayern Munich should not have defenders who make so many mistakes. The two goals they conceded in the Wolfsburg match were made by their defenders. Sacha Boey made a penalty kick in one goal, and Kim Min Jae lost the ball and scored the second goal. Bayern Munich came back in this match, but what if they hadn't? So I think the most important thing is to reinforce the defense with good players