Bayern Munich management will not allow what happened to them last season to repeat itself shortly, so they will sign players that will help them get back to their glory days. So I agree with you that Bayern Munich will be a serious contender to win the UEFA Champions League trophy when it starts next season. It is a pity that Harry Kane joined Bayern Munich at a bad time. Harry Kane put in his best and scored goals for Bayern Munich to win a trophy last season, but Bayern Munich's team spirit was low, which made them not win any trophy last season.
Bayern Munich would had been a top contender for me but they do not have a manager that we can depend on to challenge Real Madrid and Manchester city, Bayern Munich have very good players and a top striker but they can not win, I do not think they will be able to win their league in the first place because other teams will use the opportunity of Bayern Munich having a new manager that is yet to understand the team and the league to play very well so they can win the league. I do not think Bayern Munich made the right choice of hiring Vincent Kompany as their manager. There are better managers without a job that they could have hired and they will be favourites to win. Real Madrid with mbappe is going to be untouchable and they are going to defend their championship league again.
It will be hard for Kompa y to win Bundesliga next season because he is a new coach and might take him some time to make the team understand his own tactics. He might also not understand the players first but as time goes on he will understand them and be able to add value to the players football pattern due to his new tactics.
This is why I don't see them as a threat in UCL next season. I don't see Barcelona as a threat if they don't buy new additional players to strengthen the club, only a coach cannot do it all. Manchester City will try their possible best to be a threat but let's see how it goes next season with Real Madrid.