It will definitely help you improve a ton but don't think it'll make you great if you're shit. Like Adeto sort of said, if you're a casual player and you have no aim to be a great player and never try to improve, don't waste your money, otherwise, I say go for it.
That being said of course, make the jump, it's absolutely amazing. I went from 60hz to 240 last month after being on 60 my entire life and it was orgasmic. In DB I usually only drop below 200 FPS on Castle or Dockyard in certain spots, but it's usually above 200, (CPU heavy games btw haHAA) with a 1060 and an i5-4460 (4 years old btw haHAA) so I think you're set honestly.
I got mine monitor for about $270 on Sale in May https://www.amazon.com/Acer-Monitor-Abmiidprzx-FREESYNC-Technology/dp/B0759DB8ML/ref=sr_1_1?s=electronics&ie=UTF8&qid=1530152834&sr=1-1&keywords=acer+240hz and I can tell you it was 100% worth it. The stand is as firm as you could need, it's height adjustable, comes with a Display port cable, speakers (if you care for that, though they suck badly mind you so you can disable them if you'd like) the UI is amazingly intuitive and fluid. The colors are a bit crap due to being a TN panel but there is an amazon review that has a good profile in it and that has made it completely bearable.
Whatever you do, just keep in mind, you have to really give a shit for an upgrade to be worth it I think. If you desire to get better, than go ahead my dude.
Which of these monitors should I buy for 240hz gaming?
Acer Gaming Monitor 24.5” XF250Q - $279.99
Alienware 25 Gaming Monitor - AW2518Hf - $313.49