Learning from the rejection

The people who turn you down have a reason, but they're almost certainly not telling you why.

Fake reasons: I don't like the color, it's too expensive, you don't have enough references, there was a typo in your resume.

Real reasons: My boss won't let me, I don't trust you, I'm afraid of change.

By all means, make your stuff better. More important, focus on the unstated reasons that drive most rejections. And most important: Shun the non-believers and sell to people who want to go on a journey with you.