Use these simple steps to make more money [Video]

Jenny Woo’s four streams of income have taught her a few important lessons: how to start side hustles, sustain them and make them more lucrative.

Woo is a 42-year-old ex-corporate consultant and Montessori school administrative director who lectures at the University of California, Irvine, runs an online emotional intelligence course and freelances as a business consultant.

She also has a side hustle called Mind Brain Emotion where creates emotional intelligence-focused card games — 11 of them so far, on topics ranging from relationship skills to job interviews — and sells them on Amazon. The games brought in $1.71 million in revenue last year, or an average of $142,700 per month, according to documents reviewed by CNBC Make It.

The side hustle’s success is due, at least partially, to a three-step process Woo followed, she says: Keep testing your idea after you’ve launched it, use the feedback to inform your next project and repeat the cycle.

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Woo’s first …