Make shadows lighter?

I’m using cycles. Trying to keep the lit surfaces the way they are and also keep the edges of the shadows hard. But make the shadows lighter.
How can I do this?

With fill light for a specific area,or increase envroiment light to increase all shadows(world backround).In real world, the blue scattered light from the atmosphere gives us the outdoor blueish shadows.And the sun is like a key light.
Big size lights gives soft shadows,small size lights hard shadows.But this is for the keylight, it controls the hardness/softness for the shadows too.
For brighter shadows,increase the fill/backround light,this way you keep your shadows soft or hard and just gives it more light.

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