What is the right course of action now?

Your answer is fully correct because reducing speed and avoiding abrupt maneuvers are the proper actions in this scenario. According to German traffic rules, when approaching a curve, especially in rainy or wet conditions as shown, you must slow down to maintain control and adapt your speed to the road and visibility conditions. Abrupt maneuvers like sudden steering or braking can cause loss of traction, increasing the risk of skidding or accidents. Steering hard to the right is not advised here; instead, you should calmly and smoothly navigate the curve at a safe speed. Following these principles ensures safe driving and compliance with the Straßenverkehrs-Ordnung (StVO).