Question
We're a short story competition > http://mashstories.com <
with a podcast. All the shortlisted stories are read by professional narrators and broadcast as individual episodes > http://mashstories.com/podcast/ < Each episode is 3-5 minutes long. There are no genre restrictions. Although our podcast audience has been growing, it's been a rather gradual growth. We wonder how we can get bigger exposure.
Thank you for your answer in advance.
P.S. We're a on-profit platform consisting of volunteers, so big advertising budgets are not for us.
Answer
I know this space really well (I've launched two #1 rated business podcasts on iTunes).
The short answer, be a guest on other shows. That's by far the easiest way. :)