Upgrading my gaming pc

[ASauceyFellow1620]

Hey guys.I built my first rig last year and I'm thinking of upgrading . currently I have a 

 

CPU:Amd ryzen 3 2200g @3.8 GHz 

MB:Gigabyte a320m-s2h

Ram:8gb patriot viper elite ddr4 ram @2400mhz

Storage: 1tb HDD ;500gb HDD (x2)

Case:Rosewill fbm-x1 micro atx

PSU:apeiva 450w

I want to spend about 200 maybe 300 if the performance boost is worth it.I was thinking maybe Rx 570 and another 8gb ram. I mostly play fortnite and some AAA single player games. Do you think this is good enough for now , if not what would you do? Thanks for reading and responding.

[Origami Cactus]

rx570 plus 8gb of ram will give you a pretty big boost in game fps, but that psu sounds low quality, so i would maybe replace that with cx450m.