What's the best way to upgrade this PC?

Hello! I'm looking to upgrade this PC and not sure what parts would be the best to upgrade first!

Here are the specs CPU: AMD Ryzen 3 2200G with Radeon Vega Graphics, 3500 Mhz, 4 Core(s), Motherboard: ASUSTeK COMPUTER INC. PRIME B450M-A Rev X.0x RAM: 16GB GPU: MSI