Oooof… I’m afraid you can’t really shortcut time and effort.
But there are some things you can do to speed up some processes to get fast results. The downside is that you won’t learn a ton.
The first one is kitbashing.
Using existing assets to create a scene.
There are a lot of free or payed assets online. Take those and try to assemble a scene. You don’t need to model a lot. It’s rather like Lego
Make sure it all makes sense and play with the lighting.
The other one is trying to increase efficiency.
Only put a lot of time into things that will be close to the camera. Everything else in the background can be simple or have bad topology. If it’s blurry or in the dark it won’t matter at all.
Presenting the “Behind the Scenes” article for this marvellous artwork!
Feel free to explore the article written by the artist himself. It takes you through the detailed process of creating the artwork and offers valuable insights into hard-surface modelling and character-designing in Blender.