Brexit and the EU.
I am no expert on German affairs, so forgive me if I make a mistake, but from the viewpoint of the common man, Germany has made little if any impact in the last 50 years in the world of cultural affairs.
Before I begin, we need to think of the size and industrialization of the federation in comparison to the rest of the EU; Germany is by far the largest and most industrialized country in the EU, and for its size, it is probably as industrialized if not more than the USA.
Soccer - other than Bayern Munich, I doubt many people could nake five German teams who have won a trophy.
In comparison, most people can name several major Italian teams who have won trophies.
Motorcycling - Other than Maico I cannot think of any sports bikes from Germany; I count BMW as a touring bike, not a racer.
Cars - Again, other than BMW I cannot think of another German car, while it has Ferrari, Maserati, and Lamborghini.
Music - Outside of the Heavy Metal band Warlock (shown here) I struggle to think of any German group who made an impact
Opera - This area is the most significant difference when you consider the popularity of composers like Mozart, Weber, Bach, Beethoven, and Wagner to name a few. If you think of major opera houses, what names come to mind? La Scala (Milan), New York Met, The Royal Opera House, London, Kirov Theater (Leningrad), Gran Teatre del Liceu, Barcelona, and the Royal Opera House of Versailles. Being truthful I cannot think of a major opera house in Germany.
Outside of Italy, Germany has probably produced the highest number of well-known names in the world of Opera, and yet they lack a significant house to perform in; the only major house I can recall is the Wagner Theater in Bayreuth where they hold the annual Ring cycle.