Soft Shadows on directional lights?

Hi, i have a terrain scene with a directional light (and the sky sphere) but the shadows are terrible and unrealistic. Is there any way to soft the shadows so they dont look so sharp and opaque??? cant test my project properly since i cant almost see anything in my scene (trees, and foliage producing sharp and opaque shadows everywhere). I searched the forums but the only thing i found is to use some shadow options that i cant find, or using a sky light (i already have the sky sphere)

Is there any workaround about this?