Put the T.V. to either side of the fireplace and to be honest the window will be a focal point during the day where the fireplace and T.v. will be more at night .

Leave the TV by itself....doesn't need decorating but could you have glass doors put on the left side of the fireplace where your components are? If not that....take measurements and go to a store that sells baskets and find a basket that fits each shelf and put your components and discs and other miscellanious things in the baskets.

The most important thing to think about at this stage is where you want the visual focus of the room. If there is nothing else as the focal point, and you do not plan to install a TV, then making this stand out as a prominent feature (with mantel and paint or wallpaper for texture or adding a great piece of wall art) is great. Just keep in mind that electrical code may require that the outlet maintain a cover plate for safety. Please make sure whoever does this work for you knows the local codes and keeps your home safe; you can always "hide" the plate with accessories, which we have done on many jobs.

Idk if this would help, if you like B. Moore's paints - https://colorinspace.com/dwelling-palettes-1/ "Not merely to select paint color, but for entire interior; one color could work as your sofa, another for rug, and another as a dominant color in art, tile backsplash. These 12 complement each other and overall create a harmonious atmosphere."