One thing that fascinates me is discovering that what seems like a simple plot idea has been turned into an entire mini-genre of its own. I’m still agog at the wealth of Scottish Highlands time travel romances out there—who knew authors could come up with book after book from the idea?
Today, create or choose what seems to you like a basic plot idea, seemingly too narrow to be a genre or sub-genre. Then spent 20 minutes brainstorming different ways to approach that idea, such that by the time you’re done you hopefully have a whole list of book ideas, as though the plot had become a genre.
This kind of flexibility and expansion exercise can be very helpful when you’re looking at commercial outlets for your work.