Most of the games aren't for low spec pcs. You need a average pc to run valorant and cs2, also deep rock galactic is really unstable and sucks at performance. The only games the really are for low spec pcs are among us, stardew valley and brawlhalla.
Here are some multiplayer games i think is for low end machines:
Terraria
Left 4 Dead 2
Unturned (have some issues with performance but it's ok)