On a desktop basis, when the game is first run, it uses close to 6.9~7.3GB of the total 8GB RAM, but after some time, the total usage decreases to 5.7~6GB

I don't know what's taking up so much RAM

VRChat gonna use the amount of RAM you have available (most software does that btw because otherwise, it's just a waste of RAM).

I think VRChat RAM usage is too erratic, it barely uses RAM when it goes into maximum standby. / Reduced to 3.6~3.8GB including OS basic usage