In the beginning of my guitar and music studies when I asked my teachers how should I show the difference between the Tonic and the Dominant, I was talk to play the first one softer and the latter louder (The Tonic is the 1st degree and the Dominant is the 5th degree in the system of chords).
To my students I say that the Dominant can also be mysterious, modest, shy, confident, solemn etc. As well as the Tonic may have different colors and characters, depending on which story you want to tell with a classical (or any other, that has strong chords relations) piece of music.
Figure out the necessary character and make your playing-story-telling interesting! 🙂