First time solo traveling and going to Germany

In a few months I will fly into Hamburg. Im spending a few days there then taking the hbf to Leipzig, and spending 4 nights there, then going to Berlin for 5 days. I’m pretty excited about it and creating my itinerary. So far in Leipzig I have the Bach museum which and parks but not much else. Any suggestions? I kind of just want to wing it haha

I’m want to see The Cure as well in Berlin but damn those tickets are pricey!