I've been lucky enough to work with a number of entrepreneurial advisors. What the best advisors do is continually expand your sense of what's possible: they take your initial number, then add a zero. If you want to grow a $20 million business, they encourage you to think about a $200 million business. I've found this a useful concept as we've grown Media Shower, our content marketing company: keep adding a zero. Always think about the next level of scale: from 100 to 1,000 customers, from 1,000 to 10,000 customers, from 10,000 to 100,000 customers, and so on.