What should you do now?

Your answer is correct because in Germany, when another vehicle is overtaking you, you must not interfere with their maneuver by changing lanes. The rule is to maintain your lane and speed until the overtaking vehicle has fully passed. Only after the overtaking car is clearly ahead and at a safe distance should you consider changing lanes if necessary. This ensures safe and predictable traffic flow and prevents accidents. Moving into another lane prematurely or without clear necessity can obstruct other drivers and create dangerous situations.