1st build

Hi Everyone hope you guys are well, i was just checking some gaming PCs here at OC and just wanted some advice. I am looking at this PC, and just wanted some help on the build. Case Kolink Phalanx V2 ARGB Gaming Case - Black Power Supply 600W 80Plus Bronze Rated PSU CPU AMD Ryzen 5 5600X Six...

I've recently built my 1st pc, Rog strix f - 3700x - zotac 3090 - 32gb 3466mhz ram. Everytime I load up warzone or cold war i cant get more than 120 fps, I play with people on 2060supers and they are getting the same fps but I've tried everything and nothing is changing it, really not sure what...