I have a plain front door, how can I make it look more luxury?

can you add some trim to the middle and then paint in a bold colour?

Paint is always a quick fixer upper just pick your color!

If you have the ability to cut trim wood to make the door look as though it has multiple squares such as breaking it into four parts with the trim or even just two different squares, one on top of the other, such as you see done in dining rooms, then painting over it all to look high end.

I always have a wreath of something of interest hanging from my front door, since I am unable to replace or paint it

You can use trim pieces to make squares or try the newest craze of using 8x10 picture frames )glass removed) and glueing them on on the door..either one will work..then stain or paint the door and add a wreath or any decor.

Envision your door as a painting. It needs a frame to start with. Then, within that frame, ask what your home offers. Express that with colors, textures, even 3D objects.

Example: my seaside cottage door is adjacent to fishnets, buoys, etc, (frame).

I've got mixed whale profiles, cut from found wood, painted and screwed to the door. One is mounted at right angles (A Right Whale) as a door handle.

You could use some of those decorative medallions and paint over them.

i would say a rich coat of paint and some new hardware.. maybe even a nice door knocker