Any help is greatly appreciated

I was gifted a gaming PC though it's far from the best it's much better than I have currently, wondering what I could do to update it and what's compatible.

SPECS -Case deepcool matrexx 30 CPU Radeon Rx 570 GPU i5 POWER SUPPLY 600W MAX RAM 32GB MOTHERBOARD(?)

Looking to play MMORPG games like rust,tarkov,muraders etc.

Not sure what "compatible" with my case if any other info is needed please ask I will provide it! Computers working just waiting to clean it up before powering it on.