I want to change some components of my PC but...

yeah well the computer looks just fine with these settings, i would buy NVIDIA instead of AMD for a GPU, also upgrade ram from 16 to 32 or 64gb and why not if you have other SATA space buy other ssd 240 gb or even 512gb, and if you like look for some cool water cooling systems Corsair have cheap and good quality ones for the CPU!! good luck!