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Have you got any architectural visualisation experience? Or experience studying/working in architecture? If not, you can’t expect to be able to just create high-quality work. It takes years of work to be good at this stuff - not just working in a game engine, but accumulative knowledge. Studying light, material properties, how spaces are composed in terms of their mass and dimensions, how atmosphere manifests in the great buildings of the world - not to mention the technical knowledge of programs.
Get a job as an entry level arch viz artist and work your way up using more traditional tools (ray-tracers such as vray). Read books and visit buildings by the great artists - take photos and study them. There is no silver bullet, every space is different and the hidden settings don’t exist - you have to know how to manipulate the program to suit the story you want to tell.