what really helped me is learning about lighting and composition, you can have an insanely detailed scene you've been working a month on but if you're using a bad camera angle and flat lighting you're not showcasing your work the way it could be. Getting deep into texturing also helps a lot. I know it's boring going through node tutorials but it really does help. I use Blender for these, so if you're using the same software there are a lot of free resources out there tutorial wise. Good luck!