Hello!So that you can deal with your problem, you first need to understand what kind of light gives a shadow.We will assume that all sources work with VRayShadow, then we can conditionally divide them into searchlight sources of light, erea, point and dome.The searchlight includes virtually all Photometric and Standart, with the exception of Omni and Skylihgt. You can imagine them like a hand-held flashlight shining in the distance. I think you know very well which clear and long shadows give such a light source.Era (from the English area - area), these are all the light sources the emitter of light in which is the area. For example, VRayLight Plane. In it, the light source is a rectangular container of VRayLight itself. It can be imagined as a window opening shining into the room. The shadows from such a light source are less clear and more diffuse than the shadows of the searchlight stoker.The most typical representative of a point source of light is the standard Omni. In the real world of a gently sloping analogue, there is no analogue to such a light source, as in an point source a light point is an emitter of light. Conditionally, one can imagine, like an omini, a candle flame or a filament in an electric bulb. The light from such "points" spreads in all directions along the circumference and gives very blurred shadows.House (from English dome - dome) light, is a container, showing in which direction to emit ambient light, from an infinitely large dome. For example, VRayLight Dome. In the real world, it can be imagined as a celestial vault above the earth. You might think that, by analogy with the era, the dome is an area and it should give clear shadows, but the peculiarity of this source is that the dome is a hemisphere and it surrounds the scene from all sides, without having a directionality. That is, it brightens the scene objects in all directions from all sides, in the same way as GI Environment does. Such ambient light illuminates all the shadows of the scene, actually being ambient lighting.In total, you make clear shadows with the help of Terget Spot and immediately bleach them with the ambient VRayLight Dome. To get clear shadows and while your scene was not dark, you need to find the right proportions of the glow strength of the directional and ambient light sources. Also, do not forget about the GI Environment, which is probably also present in your scene and "helps" the dome to highlight all the shadows, making the scene non-contrast.