When you have enough money just buy another 8 gb and you will be good, up until then nothing to worry about just make sure you don't run any useless program on the background while playing your game
P.S. The ram and the Vram is different, a game uses RAM and VRAM, you have 8 GB ram and 8GB Vram which is pretty good,
Going 16 gb ram and 8 gb vrm will be great for some room
Cheers