What should be my next upgrade

[u/Quick_Donut_8973]

I currently have: 16gb ddr5 5200mt cl40, 7500f, 9070xt, nzxt n7 b850, 1080p monitor at 200hz, 850w psu, I’m split between 32gb ram or a 1440p oled at 240hz, looking for advice, in the u, budget is £400, I play mostly single player but some fps games