Below Cyberpunk 2077 were different entries, but mostly it was dominated by Valves Index VR Kit, CSGO, Among Us, Sea of Thieves, and Hades. It is worth noting that nearly all these games except Cyberpunk 2077 are currently on Steams Winter Sale, which ends on January 5.
Source: N4G PC Cyberpunk 2077 Is Now The Top Seller On Steam For The Seventh Consecutive Week