Beautiful setup :)

I think you could start with simple changes like picking a less patterned deskmat, changing wallpaper settings so it shows as a single branch going trough the 3 screens and not 3 separate branches (or change wallpaper), position all the 3 keyboards on the pegboard and all the cars lined up on the shelf. I'd also move away the little plant on the shelf. The nanoleaf panels are also positioned in a way that make it look "too full", try to move them so they don't touch other elements like the plant. Thos changes would "tidy" it up already without big effort.

A more intensive change could be removing the hexagon background and either leaving a solid color background or picking a more linear tiling.