How do i soften the edges of shadows without simply lowering resolution?

Hello!

I made a shader through shadergraph which i use to procedually generate cloud shadows. Problem is that i can't seem to find a way to smooth out the edges of the casted shadows. - I tried with fresnel effect in shadergraph in hopes of making the edges smooth but that didn't apply to the cast shadow. - I also tried lowering the shadow resolution, but the results were very bad and pretty useless..

The answer might be very simple but i simply could not find any answers anywhere. Also, i am using hdrp.