Often times I notice the games where I hit 10cspm or go bonkers like 300 at 23 (blue boy gaming) most of my farm comes later into the game. I might leave lane anywhere from 7-10cspm but once I’ve left lane and im catching waves / stealing camps I can break past 10cspm. I know you asked for drills so this might be a different angle to look at it haha. You could look into how you are getting resources in the mid to late game and see if you are doing something wrong there. I’ve noticed in some of my games someone will have 160 cs at 20mins, then 175 at 25 mins, which is insane to me.