Help Upgrade My Computer

Hell everyone! My name is Luke, or Kais23 as I am known on Youtube. As some of you may know, I am aspiring to become a great Youtuber, but one of the complications I have right now is the graphical power that limits what games I am able to play. Certain games, such as Subnautica, Empyrion, and ARK I am unable to play well because even on the lowest setting the game barely runs. I would love to show of these games and interact with people on these games, but due to my hardware limitations I am unable to.

Currently I have my eye set on a very good NVIDIA card that should last me for a very long time.

Link: https://www.amazon.com/dp/B012NOWERC/ref=psdc_284822_t1_B00V4HY522

Youtube has helped me through my rough times, and I someday hope to be able to do the same for others. Upgrading the hardware I currently have is just a first step. But any and all help to help me achieve my dream of being a Youtuber will be greatly appreciated.
Thank you for stopping by, and thank you for any help! ^_^