There are four key steps I’d recommend you go through:
1. brainstorm with your partners / staff / board (depending on your size) on ideas to get members
2. choose to do just 1-3 of them. They may be a mixture of techniques, such as advertising, referrals, or promotion.
3. Measure how your members are currently coming to you.
4. Repeat at #1, but this time think about improving any technique that has been working for you, rather than just new techniques.