I launched my ebook on Amazon ~6 months ago called Everything I learned about sales I learned from my dog (click here to see the book: https://thesidehustlejourney.com/in7d). I have done a few edits since then and now I feel like it is good enough to start talking to publishers.
The one thing I have been thinking about as a potential money maker from my original list is drop shipping. In a nutshell, drop shipping is where you sell someone else’s product on your website, when you get the money from the customer, you order it from your supplier at a discounted rate and then supplier ships the product directly to the customer. The beauty of this method of selling is that you don’t create or build the products and you never have to carry any inventory.