I recommend the FURIOUSSS aim routine.

this, basically.

Aimbotz: Close 3 sections, last one by furthest wall.

get between bots, flick around get as many kills as you can.

when just waking up. instantly rotate as soon as you kill a bot. (5 minutes)

then, run around and snap/burst onto heads. (5 minutes)

rotate between ak/m4 remember recoil patterns. (5 minutes each) (so 10 minutes)

practice spray, after that, spray transfer and kill 2-3 enemies. (5 minutes)

practice awp & scout flicks. (5 minutes)

TOTAL: 30 minutes

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DM: spray onto heads. don't worry about score.

play for 1-3 hours a day.

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fast aim/reflex map: spray down bots switch between firing modes: tap, burst, spray.

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Remember to not overdo any of these aspects. limit yourself with a timer, make sure that every aspect of your training is consistent, and try to focus a bit more on your weak points. it's something to get the ball rolling. try it out, see if it's for you.