1. That will be an expensive door to replace and I would not touch it if there is nothing wrong with it.
2. here are companies out there that will come out and cut your door open and install any number of glass packages in it. CAVEAT: Most of those are set up to cut holes in standard sized steel and fiberglass doors. Anything that you would cut to the width to match the current glass placement would likely undermine the strength of the door and cause it to rack and become unstable.

What is above the door, i.e. from the outside? If a 2nd floor is not directly above (I suspect it is), a sun tunnel would probably be cheaper.

Long story short, if you can't bring in daylighting from somewhere else, you are likely going to be forced into a a complete door replacement and are going to have to look at a unit that is clearly well built to accommodate a bunch of visible glass and still maintain its stability.

I love that door! so unique.

The door doesn’t look that big to me. What is width and height?

Easier - look into a Solatube to bring in sunlight.

What about a dutch door?

I’m not a pro, but that door does not look oversized to me. Have you priced a new door with more glass in it?

Here are doors with more opportunity for light.

Would you consider a new, smaller door with one or two sidelights, depending on width.

Your door is a classic, beautiful door. The reproduction doors are sadly not the same.
I would consider leaving it…possibly change your interior paint color and if that is wood, clean snd give it a protective coat to rejuvenate it.
I don’t think that unless you go all glass it’s not going to make much a difference for the cost.