Basic PC knowledge, need help upgrading parts!

Kodas

Prominent
Apr 27, 2017
6
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510
My rig is:
GeForce GTX 980 ti SLI (x2)
Win 10
Intel Core i7 5960X 3.00GHz
32gb RAM

My question is, I want to upgrade my monitors to 144hz, I'm using 1080p 60hz monitors right now. If I want to game in 144hz or 4k, what parts of my PC would I need to upgrade? or just what parts should I upgrade in general if needed, I'm looking at buying a 1080ti but I'm not sure if that's better than my sli I have now, I'm not too good with which parts are better than other parts, just know the basics. Thanks in advanced!