Hi Jue! I like that you start by introducing what the rondo form is. Learning the piano is not just about training the skills and musicality. Music theory and history also help to build up artistic ability. Also, I am glad you mentioned that music from the classical period was very gentle and dedicated. By understanding the style of each period, students can adjust their touch to achieve different sounds. I agree that students may need more practice when the melody is in the left-hand part. This part is not only the left-hand part that needs to come out, but the right-hand part that is responsible for the accompaniment also needs to be backed off or hidden a little bit. Ghosting practice for the right hand may help to get this hand soft.