Thinking about upgrading

Hey guys, my PC is getting kind of "old" and i'm thinking about upgrading it, considering the performance is starting to feel subpar.

I feel like the CPU is causing most of the problems but i'm not quite sure, and would like some advice as to what needs upgrading most. Here are the specs :

• CPU : Ryzen 3 1300X
• Motherboard : MSI B350 Gaming Plus
• RAM : 16GB of DDR4 2133MHz RAM (2*8)
• GPU : Geforce GTX 1060 6GB

Thanks for your insights !