Sure! To complement the colors #fa3d59 (vibrant pinkish-red) and #fffcfb (soft off-white), I recommend adding #4c8cff , a bright sky blue. This color will provide a refreshing contrast while keeping the palette lively and vibrant.

Here is the updated color palette in JSON format:

json
{
  "palette_name": "Vibrant Breeze",
  "colors": [
    {
      "name": "Vibrant Pinkish-Red",
      "hex_code": "
                            
                            #fa3d59
                        "
    },
    {
      "name": "Soft Off-White",
      "hex_code": "
                            
                            #fffcfb
                        "
    },
    {
      "name": "Bright Sky Blue",
      "hex_code": "
                            
                            #4c8cff
                        "
    }
  ]
}

This palette combines the energetic pinkish-red, the gentle off-white, and the refreshing sky blue, creating a cheerful and dynamic color scheme. Would you like to explore more color options or perhaps focus on a different theme?