Should I upgrade or build a new rig?

I haven't built a gaming PC since 2014 and I am not up to speed at all on current technologies. DCS has been a bit taxing on my system and I would like to improve both my FPS and turn up the quality a bit. Some AA would be nice.

This is my current build:

https://www.amazon.com/gp/product/B00KPRWB9G/ref=ppx_yo_dt_b_asin_title_o07_s02?ie=UTF8&psc=1 at 4ghz

https://www.amazon.com/gp/product/B00DWV3NM6/ref=ppx_yo_dt_b_asin_title_o07_s03?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B006EWUO22/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1

And I have DCS on an SSD.

Depending on what my bottlenecks are when it comes to DCS, I was contemplating a few options. If my CPU and DDR3 ram aren't too bad, I could pick up another graphics card of the same type for $150-$200. I could upgrade to a modern graphics card with more VRAM. Or I could keep the case, PSU, drives, and h80i cooler and basically build a new rig. If I were to invest in a new rig, I would probably not want to spend more than $700-$1,000.

What are your thoughts and what would you guys recommend?

I would keep the cpu+mobo+ram for another year and today just replace the graphics card ... it was a fast card at its prime, but that was on 2013 ... if you replace it with a RTX-2060 it will improve your graphics performance by 50%