The difficulty of this movement lies in making the distinction between tutti and solo sections audible. As one suggestion, though it deviates from the original, consider adding notes an octave lower to the left hand specifically in the tutti sections. This approach can effectively create an orchestral richness.

Alternatively, when playing normally, try emphasizing the bass significantly in the tutti sections and playing the low notes as softly as possible in the solo sections. This method adheres to the original score.

Occasionally arpeggiating the chords in the tutti sections can enhance their brilliance.

For the melody line in the solo sections, play as improvisationally as possible. Instead of being bound by the accompaniment's timing, varying the timing can be more appealing. A comparable example is the second movement of Bach's Italian Concerto; playing the solo sections freely and improvisationally will further emphasize the solo character and enhance its appeal. Please give it a try.