In addition to the response above, I would suggest that you may also want to look at whether the existing product lends itself to multiple forms of digital products. For example, could a published book in hard copy become an ebook, as well as a set of short videos, maybe an audio recording or podcast, or could subsets of the written piece become smaller, bite-sized information products in which the content is somewhat re-purposed for a specific niche or audience?

Digital products take many forms and each individual buyer prefers a different method for consuming your content. For example, I almost exclusively will listen to audiobooks vs. reading something because I have so many time constraints. If you can offer a suite of related products on platforms that are diverse, you have the best chance of reaching a much larger audience.