Hmmm… I don’t know what you’re aiming at here, realism? A pro product photo shoot look? In any case I don’t think it’s about brightness exactly, but the light setup itself. The sharp shadow happening due the small lamp size and the light falloff aren’t really flattering and easily give away its 3d render nature.
Reading about how photographers set their lighting can really help with both issues. One thing they often do is use a screen or equivalent in front of lights to get gentler shadows. They also either setup either a secondary light or a surface to bounce the light and fill in the shadows.
Translating this to 3d:
I’m using a single 4m point light + a plane to bounce some of it back. I also changed the light color to a very subtle golden hue, and used a bit of green tint on the plane (they’re tertiary colors) because a fully white light in a gray world looks sterile and unnatural.
Alternatively, you can use a HDRI to get a nice reflections and shadows and a touch of natural lighting colors. About the contrast, you can tweak it straight in Blender if you wish: Render Properties > Color Management. The Filmic option has looks ranging from Very Low Contrast to Very High and you can also further adjust them using curves, Gamma and Exposure.