if you want to improve i suggest watching demos or having someone whos better than you watching your demos
guarantee its not just your aim that could be improved. i've played with people who play blatantly wrong in terms of how they position themselves to the point where im yelling at my screen
if you get killed/shot, ask yourself why. probably like 80% of the time you could have done something to stop it (e.g they knew i would be there because i go there every round, where i was standing had too many points of entry for their team so i was unable to focus on a particular one, nobody was watching mid)
the other 20% is when you get outplayed/outaimed
this is all from an mge so dont take this too seriously