Volumetrics are tricky, and imo normally weak looking, all by themselves.

I normally use a round spotlight. I'll position it and aim it how I think I want it, then in the spotlights Light Lab, I make sure that Visibile Object, Volume and Infinite Light are all activated, and I take the intensity up fairly high, so I can more easily see it to begin with, and then later on I'll start backing the Intensity down, until it gets down to where I want it.

I usually set my Edge Softness to 25. But that is not essential.

After that, I duplicate the spotlight, convert it to a cone, and apply a volumetric (fog) material to that. the cone I will increase in size until it entirely covers any area where light/volumetrics would be.

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