PC upgrade help

without knowing your use case, I'd say the biggest performance uplift you would see would be to get a 5800x3d processor. I think the B450 motherboard is compatible with that cpu (you would need to update your motherboard bios however). To make sure, you would probably need to contact skytech and ask them what motherboard you have, and if they can provide a link to the bios. Or if you can get the exact motherboard make and model, you could also get it from the motherboard manufacturer