How can I improve my computer?

How can I improve my computer? Its pretty bad at the moment. Frame rate drops in every game imaginable.

What is your intended use for this build? The more details the better.

Gaming. I pretty much only play single player games (open world games like: Skyrim, Fallout4) with like 100 mods installed on the side.

If gaming, what kind of performance are you looking for? (Screen resolution, framerate, game settings)

I have 1920x1080 display. Like I said, I want to play single player games like Fallout 4 on moderate/high settings with a good frame rate, even with a bunch of mods installed.

What is your budget (ballpark is okay)?

$600, maybe $700 if it's good...

In what country are you purchasing your parts?

New Zealand

My computer right now:

CPU: AMD A8-7650K Radeon R7 Compute Cores 4C+6G 3.30 GHZ

Motherboard: Gigabyte Technology Co., Ltd. (Product:) F2A78M-HD2

RAM: 4G

Video card: AMD Radeon R7 360 series

Provide any additional details you wish below.

if u have any questions i'll answer