I don't know what Tuchel should be thanked for. This data is so clear cut that nobody should actually come to the conclusion that it was right to fire Nagelsmann based on that data alone. There might have been other reasons, but Tuchel hasn't achieved any improvement or progress at all. He achieved the opposite and almost even lost the Bundesliga title, but Dortmund came to the rescue.
We don't know why Nagelsmann was fired. But the decision to fire Nagelsmann was not correct. Bayern Munich's performance further deteriorated after the sacking of Nagelsmann. They were eliminated from the Champions League after losing badly against Manchester City. Bayern Munich's performance in the Bundesliga was not good either.
Tuchel in Munich is not yet successful. Out of 12 matches, Bayern Munich has won 6 matches and lost 4 matches. We are not sure if Tuchel can strengthen this team next season. But Tuchel is experienced enough. Hopefully, he will be successful with the Munich team.
I know Nagelsmann was fired because his team was not stable enough and they had bad results in some games. also, he had bad relations with players like Manuel Neuer.
The Bayern Munich team has been really lucky this season. Because this team did not perform very well in the last stage of the league, on the other hand, if Dortmund had not drawn with two goals in the last match, Bayern Munich could not have secured the title.
It is a thing that has passed and can only be remembered as history by Dortmund. And because Dortmund have almost managed to get another trophy in the Bundesliga, that means that Dortmund still have to try to do better next season by winning more every game since the start of the season so that Dortmund can more easily secure themselves to become champions again in the Bundesliga. Because competition in the Bundesliga is fierce again and next season is unlikely to be much different from this season.
This season Dortmund has performed quite well even though they haven't really been able to have the expected first position but at least there has been some progress compared to last season.
If they can improve a number of players who feel they are not too influential then next season they will get first place in the Bundesliga.
Bayern Munich will be the team that will hinder Dortmund from reaching the top of the standings next season.
The Dortmund performance was not good at all because they lost the chance they had to win the title in this league, Dortmund could easily use the chance they had when Bayern Munichwas not in good from but in the end Bayern Munich won the Bundesliga title for another time.