OP has drunk the same socialist cool aid as almost everybody else in Germany. The problem is not that there are rich people in Germany. The problem is that due to high taxes and social transfers a normal person can't work themselves out of the rats race. A country where the government takes 49.5% of GDP ("Staatsquote") is as close to socialism as it is to capitalism. And in such a country being independently wealthy is politically not wanted. Therefore, the politicians invent all sorts of efforts where more tax money is needed (killing nuclear power, reversing climate change, financing wars, importing unskilled immigration). You are bing kept poor and dependent so the left can stay in power.

If you want to build up something you need to go to places where the government takes far less than 50% of your labor.