To improve your aim i recommend you use this map https://steamproxy.com/sharedfiles/filedetails/?id=243702660&searchtext=aim+botz i think its perfect i practice more than 30minutes and when i play my comp my aim is super better because this map its pretty good

to rank up u need to extract 200% of your mini map, use it everytime you can to see your teammates or your enemies so use your map everytime you can to see your teammates

its very important to know the smokes about the map u are gonna play because is better to enter if u play T and is a litle bit better to protect too so if you wanna play dont forget to know some smokes and now i will show some smokes

Mirage: https://www.youtube.com/watch?v=zInlDBuwu4k

Dust II: https://www.youtube.com/watch?v=XDCja2ckJCg

Inferno: https://www.youtube.com/watch?v=237KtKF9MDU

Nuke: https://www.youtube.com/watch?v=Y1-kDEZn1Ws

Overpass: https://www.youtube.com/watch?v=valajWWsXcI

Vertigo: https://www.youtube.com/watch?v=tBnrwnPG19U

and the new one Ancient: https://www.youtube.com/watch?v=VDkwtRohj-s

Always as you can use your mic to say the position of ur enemy so see this exemple if u are the entry fragger u go in front so if u enter u can try kill and if u dont kill u use ur mic to tell ur mates the position of the enemy or now u can ping too or u can use the mic to say"at 1:40 we use togheter " and always say good job nice round to be positive and pls dont use your mic to flame your mates

Using all this tips you maybe go rank up
GOOD LUCK SOLDIER!!