PCF Filtering doesnt work quite well

Hi, I have enabled pcf filtering in my shader yet it doesnt work well. I dont get soft shadows. How can I address this issue?

float2 offset(int u, int v, float sm_size)
{
    return float2(u * (1.0f / sm_size), v * (1.0f / sm_size));
}

float SampleDepthMap(Texture2D texArr[3], int index, float2 coord, float lightDepthValue)
{
	float ret = 0;
    if(index == 0)
    {
		for (float y = -1.5; y <= 1.5; y += 1.0)
		{
			for (float x = -1.5; x <= 1.5; x += 1.0)
			{
				ret += texArr[0].SampleCmpLevelZero(ssModelCSM, coord + offset(x, y, 4096), lightDepthValue);
			}
		}

    }
    else if(index == 1 …