Consistency is a result of environment and systems, not willpower. If you have to "decide" to prospect every day, you will eventually decide not to. You need to make your key activities non-negotiable parts of your schedule.
Create an environment that supports consistency. If you need to make calls, leave your phone in the other room until it's time to work. Use "if-then" planning: If it is 9:00 AM, then I am on the phone. By removing the need to make a decision, you make consistency the path of least resistance.