You are wrong for many reasons. Germany has been prosperous because of its export driven economy. Your products have become uncompetitive for a number of reasons.
Your demographics are in the toilet and the Eastern European countries Germany has been using for cheap labor are not far behind you. You need cheap labor and cheap capital which will be in ever shorter supply as your population ages.
Your current source of cheap gas energy has vanished. With it a lot of your manufacturing is moving. BASF, Volkswagen, ArcelorMittal are all examples of German companies seeing the writing on the wall and moving production out of the country.
The US is backing away from free trade and is becoming less willing to underwrite the global order that Germany depends upon. The only trade agreements the U.S. has made are for NAFTA.
The U.S. is decoupling from the global order it built after WW2 and reshoring its industrial plant in N.A. Germany doesn’t have the military to ensure freedom of navigation for its trade goods.
Germanys trading partners are in just as bad of shape and/or becoming competitive. The Economy’s across the Eurozone look just as bad. China itself is going through a major downturn and in many areas are competing directly with Europeans in their own market (EVs).
To be clear I’m not saying this is the end of Germany. But there are some major structural challenges that cannot be simply papered over.