Spoiler: Paying someone to "SEO" your existing podcast's content isn't the solution to getting more attention from Google.
If you really want Google to pay attention to your podcast's content (which means including your podcast's episodes in relevant searches), you have to change your mindset and involve Google earlier in the process.
This isn't an episode about SEO. Rather, it's an episode to get you think like a person who does SEO strategy. Yes, it is possible for you to create content in a format and style you want that still resonates with Google. But it's very hard to do that -- if not impossible -- after the content has already been created.