Most architectural illustration work nowadays will have you working off of existing 3D REVIT models, so don’t get too stressed out about modeling structural detail and scales.
90% of your work will be in set dressing, texturing and lighting - and these are areas where you can certainly improve and really make your work stand out!
One of the most well known pieces of architectural rendering is Alex Romans The Third & The Seventh.
When I first started I spent a long time trying to recreate his ‘style’ of camera and texture work. Now, most commercial work is VERY far from this - but his set dressing and lighting are exceptional ‘extremes’ to work towards.
I think that you should take one of your existing models - and try to emulate one shot from Alex’s work. Be artistic - be extreme. The lessons you take from recreating his level of detail and ‘feel’ will translate to your other works.
I also think you should take your work, and try to match it to a photograph.
For example, relight and redress this image:
Not that you are trying to create and AESTHETIC. A ‘feel’ for the space. Don’t be afraid to push your lighting!