I've been thinking about this with my software podcast too! (
https://softwareatscale.dev). Was thinking of posting something similar here.
You already have more downloads than I do, so you can take my advice with a grain of salt.
- My written articles have done well and drove a bunch of signups to my newsletter. That introduces people to the podcast (substack lets me do combined newsletter/podcast). People are more likely to share and read articles, and the really interested ones tend to listen to the show as well.
- I use Descript to make YouTube clips of the show, and link to the full episode, where people can listen to episodes. I've found that a successful YouTube video doesn't drive that many sign ups/subscribers to the show, but drives subscribers on YouTube.
- Some influential guests on the show drive a "pop" when they retweet their episode.
- It took about 3-4 months to show up on Google when you search for "Software at Scale", but that drives some organic traffic.
- I get some of my new subscribers for the podcast by posting in relevant subreddits like r/programming. It's a struggle :-)