Here’s the updated color palette with a more muted color replacing Sage Green:

 <Aesthetic Black & White>
1. Black - 
          
          #000000
        - A deep, rich black that provides a strong foundation and contrast.
2. White - 
          
          #FFFFFF
        - A clean, pure white that creates space and balance.
3. Soft Gray - 
          
          #B0B0B0
        - A gentle gray that adds depth without overwhelming the palette.
4. Olive Green - 
          
          #4A4E2A
        - A muted, earthy green that brings a subtle touch of nature without being too bright.
5. Deep Navy - 
          
          #001F3F
        - A sophisticated navy blue that introduces a sense of stability and elegance.

This revised palette incorporates Olive Green, which offers a more understated, earthy feel, while maintaining the elegance of the black and white theme. It creates a balanced and professional appearance suitable for a dynamic report.

Would you like advice on how to implement this palette in your report layout? Or do you have any further changes in mind?