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>learn utility on mapsOn lower ranks, good utility can straight up win you entire games. This is because good utility forces your opponents to play a certain way. Going back to our example of Mirage again, but this is why instantly incin-ing ramp on CT side as an A player is so good, because then you can't get race-car peeked on ramp during the first quarter of the round. You can also then chase it with a smoke to buy even more time against the enemy, in which your team can get info on the rest of the map. This sort of utility forces the opponent to not push unless they want to be at a disadvantage.
Another good one is on T side if you are lurking underpass. If you underhand a flashbang every time you run into underpass, you deny anyone pushing that on the CT side by completely blinding them, then getting a kill. A side effect of this is that you also are setting the precedent for the enemies to respect that for the rest of the game because you could just do that again, and at that point the hard counter while accomplishing the same goal would be to play anti-flash alone in underpass while pushing which is terrible since you could just then get dry peeked.
>learn how to play with teammatesWhile I said aim was important, I think playing with teammates is going to naturally get you more wins overall. Josh Nissan (steel) has an amazing series that, while created a decade ago at this point, is top tier for learning the terminology and the actions behind that terminology.
https://www.youtube.com/playlist?list=PLQcRYyog5iq4h9bJNC0s3Yl9Ux4ZJvGDd
Do the other two things first a bit, then come back to this to learn the applications of those two things. I guarantee you that you will get better and the game will be much more enjoyable as a result.