True - I used to have the same problem when I lived in Germany, I worked in English but at least the language of the street was German. I used to go on week-long diving holidays where I was trapped on a boat with only German speakers - made a huge difference!

My suggestion would be to track down some German speakers and work and ask them if you can only interact with them in German. There's also radio, TV and newspapers... Or find some people with really bad English skills to be your friend - this always works well