I received some brilliant advice today. So obvious.
Do 2 Cold Calls per Day. 1 in the morning and 1 in the afternoon. If you stick to that, it's 40 cold calls per month!! If you miss a day, forgive yourself, and stick to 2 cold calls per day, don't recover to 4 calls.
If you're busy for several days or away on holiday, come back to 2 Cold Calls per Day.