need help with picking new parts!

[harry heaven]

i have had my pc for around 1/2 years now i haven't upgraded it yet but i was thinking about upgrading to make it run games a lot better then what it already can.
my pc - processor intel(R) Core(TM)i56600k CPU @ 3.50GHz
graphics is a 970 nvidia
ram 8gb (got another 8gb coming)
storage 1 tb
mother-board ASUS Z170-E
i dont really know a lot of stuff about pc parts lmao but any help would be nice and helpful. i can run any game with good fps but wondering what i can upgrade for the future
thanks

 

[harry heaven]

Clock that 6600K (get a decent cooler if you haven't got one already) and slot in a new GPU.

What is your budget and what is the make/model of your monitor?

i have got a 144hz benq minitor and my SSD is
Seagate Desktop HDD 1TB

my budget would be around couple hundred i would say 400-700