One way to get a bestseller is to write about what everyone's thinking. The trick is to figure what that is. What is everyone thinking?
Another way to get a bestseller is to make everyone think about what you've written.
Another way is to think up something new and different and get the word out before someone else thinks about it.
Yet another way to get a bestseller is to write something shocking.
One more way to get a bestseller is to do lots of promotion.
Another way is to have a really great cover.
Don't forget great reviews and back cover blurbs.
Or, if you're a celebrity, you could write just about anything, or hire a ghostwriter, and you'd get a bestseller.
These are some ways, which can be done alone or in combination.
Any other ideas about how to get a bestseller? Or, maybe you can tell us of some instances where one of these methods worked for yourself or someone else. If so, I and the rest of us would like to hear about it.
Here's hoping at least one of these ideas will work. (g)