Lol, don't be silly. That CPU will be good for another 2-3 years as long as you overclock it. Overclock it to 4.3-4.5 GHz range, I'm doing 4.4 GHz because it takes too much voltage for me to hit 4.5 GHz, poor luck of the draw when it comes to silicon lottery for me. My 1080 Ti is also a very poor overclocker for the core.... Oh wait, is it a 4790k? That doesn't quite as desperately need an overclock as the 4770k series. Although a 4790k could still be overclocked to 4.6-4.8 GHz range, 5 if super lucky.
CPU upgrades have been very minor over the last few years, and high clocked DDR3 isn't that much slower than DDR4 in real world performance. Hopefully, you don't have DDR3 running at 1600 or slower, my DDr3 is at 2166. Try waiting it out for DDR5 which should be 2019-2020ish, who knows Intel might finally release a decent CPU upgrade by then..
