Hey Daikon,
If you meant upgrading it for gaming, what I would do is add a GPU to the build
get a 1660 or an rx580 (if you can find them for a good price lol) maybe look for a used card.
just make sure your power supply is a good quality one so you don't run into any issues in the future.
it should run games at 1080p at 60fps until you start upgrading your quadcore CPU to something better. Also maybe add a second stick of ram down the line since your CPU isn't the worst.
you'll also need a hard drive if you don't have one.
Good luck.