I am asking this because I have found that only one publisher, Smashwords, has been able to distribute my ebook titles to various smart phone and app companies like Apple, Kobo, etc., while sales have languished at best on Amazon. While I have spent the last four years promoting my books it seems like people are going back to buying print because the smart phones cannot host illustrated volumes and larger books without slowing down; and I have been told that reading one book for an hour drains a phone's battery significantly. I produce PDFs myself for sale, but that does not appear to be popular anymore. Are there any suggestions about how to keep my titles fresh while I'm writing more? There seems to be a lack of interest in books in general on the internet.