I have 240Hz, i lock my FPS at 230 in graphic drivers, turn on Freesync and Vsync. It feels great.

Why do you lock the FPS? You can't hit more than 120 at a particular game? If monitor supports G-Sync it will adapt refresh rate accordingly. For example, if you hit 150–160 fps it will get down to 150-160Hz etc. There is no need in locking.

human eye cant see above 60hz

Is normal, like you're limiting the monitor native hz so don't expect to be smooth. Just upgrade your pc to reach 240fps.

Play valorant

it does cause your eyes get used to the 240 and then when you go below, your eye's then can tell the difference go and play 60 or 30 fps game, then play 120 and 120 will feel so good for some reason

human eye cant see over 60 hz

try play in 60hz for a week

Why would you expect to get more than 120fps in CS2?

Upgrade pc so your monitor is worth for what it can perform on (240hz) its worth it

set your monitor to around 144-165 and benefit from lower ghosting and overshoot until you upgrade

What's happening is that your panel was designed with a specific resolution and refresh rate, once you run anything but the designed resolution and refresh rate, you are going out of spec, even if it seems like an inferior spec to you. Indeed 120hz is inferior to 240hz, but your monitor's active matrix was manufactured for 240hz, therefore doing anything but 240hz will force your monitor's "motherboard" lets call it, to essentially have to run a bunch of processing and re-scaling. It doesn't matter how cheap or expensive your flat panel is, all flat panels are like this, including 2000$ OLEDs. On top of all of this, the processing will add motion blur, not like the graphical effect you turn on games but actual motion blur, as in, lack of motion clarity, your pixels will struggle more to update because on top of the refresh rate, there is also the processing and this will break apart moving pictures, you cant escape it. The only ways to get around it are A) Buy a lower spec monitor, though 120hz is going to be used probably, but a good 120hz monitor from 2012 will feel smoother than your 240hz being set to 120hz, the picture will look clearer while moving and the overall input lag will be lower, feel snappier. B) Buy a CRT Monitor , but you'll rarely get to 240hz, though of course, 100hz on CRT is more or less equivalent to 1000hz on Flat Panel (LED-OLED).