I once saw some advice from a podcast guru in their *paid* Facebook group telling someone who wanted to double their audience to produce twice as many shows to do it... need I say more?
Your next steps
I teach podcasting a lot, and usually for free. So, here's what I'd recommend you do next:
P.S. you can start engaging with your listeners using AWeber. It's free, no credit card required: https://www.MarkAsquith.com/AWeber