Become good at CS:GO?

You want at least 100 hours into the game before you even attempt a matchmaking game... turn aim acceleration off, go for a low sensi + a big mouse pad, learn the basics of economy, what guns to buy and when, learn spray control, learn how to move and shoot, dont give up... ive got like 1.4k hours on the game, many more watching pro games and learning from them and tutorials, just takes time. one thing to consider is its as much about building the muscle fibres and muscle memory to aim as it is learning the games META... youl get to a point where you see a target and you automatically flick straight to his head and 1 tap.. no thought needed. takes time