This technique worked well for my previous book and helped me to validate the demand for a product, so I decided to use the same strategy also for this book.
I publically shared the list of my product ideas on Medium. Such ideas are an example of the results of using the frameworks I'll describe in my book.
The article included a teaser with a link to MailChimp form to get notified when the book is available.
The result: Received great feedbacks and some traction from Twitter, but failed to build a sustainable organic stream of traffic.