So I would like to upgrade my PC so that I can consistently maintain at least 144 frames and still have great graphics. In Fortnite I maintain 60 fps but when in a fight or anywhere with a lot of clutter, I drop to 30. In Doom at extremely low settings I maintain a 20 fps, so you can see why I am eager for an upgrade. I am extremely inexperienced with PC parts. I'm not sure what parts would be best or even compatible with what I currently have. i would most greatly appreciate any help I could possibly get. My budget is around 400 and my PC specs are as follows.
AMD FX 6300 Six-Core Processor 3.50 GHz
8GB of RAM
AMD Radeon RX 560 graphics
AMD FX 6300 Six-Core Processor 3.50 GHz
8GB of RAM
AMD Radeon RX 560 graphics