Unplug your gaming PC and put it in a closet for a week. See how your time use changes.
Investigate getting really long monitor / keyboard / mouse cables, so you can have the desktop PC somewhere besides your workstation, but still have low-ping access to it from your workstation. (Alternatively, remote into it from elsewhere, though this may run into graphics issues.)
Become at peace with the space it takes up around your workstation.
Possible approaches:
Unplug your gaming PC and put it in a closet for a week. See how your time use changes.
Investigate getting really long monitor / keyboard / mouse cables, so you can have the desktop PC somewhere besides your workstation, but still have low-ping access to it from your workstation. (Alternatively, remote into it from elsewhere, though this may run into graphics issues.)
Become at peace with the space it takes up around your workstation.
I think I already often go weeks without turning the machine on. I have a lot of fun whenever I get into a game, but it doesn’t happen often.