What is the right course of action?

Your answer is correct because in this situation, you must continue braking and remain waiting in your lane for now. According to German traffic rules, when you approach an obstacle blocking your lane, such as a parked truck, you first have to slow down and prepare to stop if necessary. You should not immediately steer to the left or change lanes until you are sure it is safe and clear. Only after careful observation—checking mirrors, blind spot, and signaling your intention—can you maneuver around the obstacle. This cautious approach helps prevent accidents, especially if pedestrians or other vehicles are nearby. Practicing patience and good observation is key to safely handling similar scenarios in the future.