What do you want?

Wallpaper the back wall of the built-ins.

I would paint the wall and cabinets all the same color. The two-tone is distracting.

The center unit can easily be altered to accommodate a TV if that is where you wish to place it.

Replace the ceiling fan with a chandelier.

I don’t love that they’re separate and not one big unit but I don’t think it’s worth the expense to change that. Agree with wallpapering the back. You could also install some lighting. Once you have (carefully but simply) styled the shelves and have furniture in the room, you’ll be more focused on that. It will look great!

I like the idea of redoing middle section with tv in it, will have to measure our TV to see if it fits, was trying to figure out if it was worth it to remove walls in between .

I don't know why people hate ceiling fans. They cool my house without a/

Are the shelves fixed in place or adjustable? That makes a big difference in what we can suggest.
Is this a formal living room or a family room? If you want to put a TV in the middle section, can the dividers be removed to allow the TV to be at eye level to a seated adult?

You could possibly take out some of the shelves in the middle portion and insert a TV. It might look a bit like this design we did for a client:

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