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You average 6.3 CS per minute as Mid; Master players average about 7.8. Every 15 CS is roughly a kill worth of gold. Practise last-hitting under tower, shove the wave before recalling, and catch side waves between fights instead of standing in lane doing nothing.
You played 9 different champions in your last 15 games. Consistency comes from mastery: pick two or three champions for your main role and play them until the mechanics are automatic.
Your main role is only 47% of your games. Each role has different macro; playing one primary and one secondary role gets you a lot more repetitions of the same decisions.
