That's why hired Thomas Tuchel, because of his experience in the champions league and they know a coach like Tuchel knows the way to make a team win the Champions League. On the other hand, Tuchel got a chance to have better teams than last season they are still hiring players like Kane for the next season which can increase their chances.
I also believe that next season Bayern Munich will be very different from last season, because Thomas Tuchel is trying to make the Bayern Munich team stronger than the previous season because Thomas Tuchel will make a more accurate proof next season where Bayern Munich is still a team to be reckoned with in the Champions League along with its domestic league as well. Player recruitment will continue this season and I also want to see if Bayern Munich can really get Kane.
I'm not going to say that we expect to see a miracle from Thomas Tuchel and his payers in the next season but the fact about ith coach is mostly about the experience he got in the champions league which can be usually for Bayern Munich which is the main reason for them to hire this coach.