As others have already said, the question is almost impossible to answer. But when I look at the route, Munich doesn't make much sense. I probably wouldn't have chosen Berlin as a base, but that's a matter of taste. If you still have time left over, I would rather spend it in Cologne, Bruges, Ghent or France, for example. In between are many things that are actually a "must" from my point of view, but are rather unrealistic on such a wide-ranging trip. How many weeks are we talking about anyway?