The best place to start is to remember no product shots come “out of the camera”. They usually involve hours of re-touching, compositing from multiple shots etc.
The same skills you’d use for art directing a product shoot can go towards renderings. Is the lighting coming across the different areas the way you want? You don’t always need to focus on getting every single detail perfect in one shot. Try to get the highlights and materials right, then composite them together if needed.
Rendering clown passes in Keyshot is a great tool to quickly allow you to mask and tweak specific levels on certain parts. Logo doesn’t have enough pop? - adjust it independently of the other elements. Screen needs that perfect white highlight? Add a gradient in photoshop.
If you want realistic looking bokeh/background blur, using a depth pass + the Camera blur filter is also a great way of achieving a really nice result without having to spend hours letting Keyshot calculate it. And you can manually control the level of blur you want rather than having to render again.