Luck really was the biggest factor for Bayern Munich to win the Bundesliga title. Thanks to Dortmund's throw Bayern Munich still managed to make it to the title magically. But of course Bayern Munich board wouldn't be happy with the general look. Nagelsmann had the biggest share in this bad run of course but I can't say it was only him.
I won't put any blame on Tuchel first of all because he didn't have enough time to make the team become successful in the remaining time period of the season. I'm going to say that Bayern Munich didn't have a striker like Lewandowski which was one of the main reasons why they had big issues with getting proper wins in quite many matches. I hope to see them finding the one for the position this summer.
Bayern Munich hopes are certainly on Mane. As a replacement for Lewandoski. But Mane has had a difficult season. Had a good debut, but in some matches Mane performed poorly and even argued with Sane in one team. But Mane jiga is not bad, he can score 12 goals and 6 passes. So I think he just needs some adaptation time. But I don't understand if he will stay or leave. I saw on social media that he was in demand by clubs from Arabia.