Check out Keyshot’s webinar on youtube, they’re really great. What allows you to take your Keyshot renders to the next level really is the Photoshop work. My biggest break through was with the passes you can do. Like breaking down by groups or the clown pass that allows for super fast selection. You can then very easily render out with different lighting and materials and blend everything nicely together in Photoshop.
I also learned quite a bit by looking at how product photographers work. There’s a bunch of product photography tutorials on Youtube as well. You can learn a lot about how to setup your lighting and composites from them as well as understand how some of your reference images may have been lit to start with.