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If you can get the pc off the floor towards that open space on your far left desk area, or even to the far right under the desk, it’s probably better to keep it away from the wall radiator heater under there. You could try a few little accent lights (anything glowing), like maybe some of those rope leds you can design into a squiggle for that wall space above the desk on the right (like this: https://a.co/d/0dQB6VL9), and maybe some backlight rgb leds for behind your monitors (I just got these for behind my monitor to light up my desk wall: https://a.co/d/0eZoahuG) Also fake plants can do wonders. Mix and match long flowing ones that hang down for higher up on the built in shelves to the right and little spiky ones on that window sill. Target and Ikea have cheap ones that look decent especially in darker rooms; you can’t immediately tell they’re fake and they do wonders for mood ime. Overall, additional lighting and focusing on balancing their placement will go a long way to make it moodier and more relaxing/engaging. And finding tchotchkes or figurines that you like to add more of “you” to the space. I have some Star Wars android figurines and some old McDs happy meal toys from my childhood on my desk and they make me happy :) Gaming should be fun and creative imo. Good luck!