Your past podcast content can do a lot more work for you to drive traffic, build credibility, open doors to prospects. I'm counting on the fact that you have a site for your podcast episodes and that you are connected in all the usual spots: iTunes, Stitcher, Libsyn, Blubrry, GooglePlay, etc. But you've had your show a long time. Why not put a new spin on past great episodes - new title, graphics and cover different points in the post, possibly edit the file a smidge or add commentary to the file? This can give you more content, easier and breath new life into your feed.
Most of the time, after 20 episodes, your past doesn't show on your iTunes channel. If you bring back a show going back further, you not only can revisit a topic, but you can reach out again to that guest and let them know you still find their episode valuable and want to give it more exposure. Send them the embed code, new graphics, new link and see what happens.
For more tips, or if your team is stretched already, come up with a monthly budget to schedule out 2-4 of these "best of" episodes each month and let me help you. [email protected]