It seems to me there are rather more opportunities in digital than in bookstore retailing. For example bundles of series novels ought to be easier to put together and available with a single click -- hard to do that in a book store.
But it's down to the publishers and retailers. I'm unconvinced individual authors can do much to increase their sales. The push has to come from above.
Glad you like the blog. Finding a bit more time for it at the moment.