The march continues!
Watch the War Awl for tactics, practise nades, get the aim 10/10 and you'll be Master Guardian Elite before you know it.
After that you'll need everything mentioned above to be 12/10 and a good game sense.
I can't be arsed to practise nades etc. so I'll never get above Master Guardian, but after my week ban I haven't played any CSGO anyway... Bloody VAC system kicking me from matches..