Sounds like you are off to a great start. In order to make the phone ring, you will need to develop a marketing plan that will continue to amplify your reach. Here are 3 things that quickly came to mind:
1 - If you are already on social networks, are you connecting to groups and sharing your information and/or posting snippets of the podcast to gather interest?
2 - With your current followers, what can you do to have them advocate for you? Use your list to provide opportunities for others to connect you to more coaching clients.
3 - Connect with others in your field that can enhance your coaching offering and develop a mutual alliance or strategy to share resources, lists, create a bundle package offer.
I would be happy to brainstorm more ideas with you and develop steps to implement. Understanding the focus material will create more steps. Let me know how I can help.
If you aren't already doing this, it might be worth using the insights from your podcast on other outlets as well, e.g. sound bites on twitter, key insights on blog posts, and email newsletter which allows individual articles to be shared on social media easily, setting up a profile on clarity.fm for paid business consultations, carefully cultivating relationships with some journalists, bloggers who write articles related to areas of your expertise.
Also, it might be worthwhile surveying your podcast audience to find out what they like/love vs. don't like/hate (think a 2*2 matrix) about your podcast, so you can make the existing audience stickier and potentially expand the audience.
Most importantly, find something Authentic that you can share with your listeners to improve their lives.
Aubrey Marcus spoke about growing his million dollar business (Onnit) using an influential podcast. You can hear that interview here: < lewishowes.com/ep35 >
It's all about Authenticity with podcasts. You could always ask them! :)
Well let's assume that you have 500 customers which you acquired via your podcast and sold them your consulting / coaching services. So because you have this customer base, then your job is not to find more customers ("having the phone ring") your job is to find more products / services for your existing customers to buy.
Now because you're a consultant (coach) - it's the same as being a freelancer - in other words your return on equity is low, because you can't leverage your time.
So by selling more products to your existing customers you'll be able to significantly drive the bottom line of your business.. and you'll be able to generate far more revenue in the long run.
Happy to chat further...