There is a video of Steve Jobs showing him talk about being successful is what you say no to, not what you say yes to.

I often ask my daughters. “What have you said no to today?”

Sometimes these are very simple, “I didn’t buy a Starbucks drink”, could easily be a good thing to say no to. Others are more business directed and thoughtful. But try and keep track of them, write them down to remind yourself why you are saying no to those things.