Consider a workbook companion for your nonfiction.

Something new from Infinity Publishing blog:

Turn Your Non-Fiction Book into a Workbook

By Arthur Gutch, Mon, May 16, 2016 @ 09:29 AM

While it's true that independent authors make more money on digital books than hard copy, traditional publishing can offer additional income through add-on books. If your non-fiction work is in the self-help category, or if it teaches how to do something, creating a companion workbook can give you another income stream. Older books can benefit from this treatment, as well. If your book's been out for six months or more, publishing a workbook that features your non-fiction book can uncover additional sources of readership you might never have found before.

Here is the full link to the article...