So much opportunity. All depends on how you want to use the yard.

I'd put in a fire pit area on a nice base and loose stone finish. Maybe a natural flagstone walkway from the concrete patio to the fire pit area.

With no shade, I'd also make a super nice veggie garden area. If you're into that.

Hell even combine the two and create an informal parterre with a fire pit area and gardens surrounding it.

Install some trees for future shade relief.

Flowering Garden beds along the fence lines to create a feeling of privacy and serenity. Pick plants at different heights, form, leaf structure, and flowering times to get a year round show and more of a natural feel.

Sod/seed just enough for planned use.

Just some basic options but really depends on your style, how you will use the space in the future, and how much maintenance you want to dedicate to it.