It depends on what you like to do, what you know (experience) and what niche.
First thing that pops into my head when I see those domains..........
Make reviews about ebooks and software that do NOT live up to their promise.
Let people signup for your free newsletter and keep them posted about new reviews you make.
When you made a review about something that you didn't like, show them what you do like (with your affiliate link of course, cloaked lol) for a product in the same niche.
People are always looking for reviews on products, it doesn't matter what the product is.
Hope this helps, for this you need to love reading, writing (or rewriting) and studying what does and what doesn't work.
But for anything on the internet, it takes work, there isn't a free ride.....