Here’s a monochromatic version of your existing harmonious color palette, while still maintaining readability and the overall theme. I’ve selected shades of blue to create a cohesive look.

json
{
  "palette_name": "Monochromatic Blue Palette for Readability",
  "colors": [
    {
      "name": "Sky Blue",
      "hex_code": "
          
          #87CEEB
       "
    },
    {
      "name": "Light Sky Blue",
      "hex_code": "
          
          #B0E0E6
       "
    },
    {
      "name": "Powder Blue",
      "hex_code": "
          
          #B0C4DE
       "
    },
    {
      "name": "Periwinkle",
      "hex_code": "
          
          #CCCCFF
       "
    },
    {
      "name": "Alice Blue",
      "hex_code": "
          
          #F0F8FF
       "
    },
    {
      "name": "Steel Blue",
      "hex_code": "
          
          #4682B4
       "
    },
    {
      "name": "Light Steel Blue",
      "hex_code": "
          
          #D3D3D3
       "
    },
    {
      "name": "Deep Sky Blue",
      "hex_code": "
          
          #00BFFF
       "
    },
    {
      "name": "Slate Blue",
      "hex_code": "
          
          #6A5ACD
       "
    },
    {
      "name": "Dodger Blue",
      "hex_code": "
          
          #1E90FF
       "
    }
  ]
}

This updated palette features various shades of blue that enhance readability while still providing a harmonious visual experience. Would you like to make any further adjustments, or do you need assistance with something else?