Blur shader creation using Shader Graph

[shell kindle]

I have created a way to sample a texture multiple times but the edges look sharp. How can I make these scattered sample textures to get blended smoothly creating the effect as shown in the third image?

[dull ridge]

I can only see portion of the shader so not fully sure of your approach but generally you would need a lot of samples to get smoot blur. Two pass (horizontal and vertical) gaussian blur for example can save some samples but still quite some are required in each direction if you want to blur this type of hard edge image