EVERY SUNDAY I RUN A PROMO POST FOR MOSTLY INDIE WRITERS:  Book Promo And Vignettes by Luke, Mary Catelli and ‘Nother Mike.

There’s also a vignette-writing challenge, and some of them have sparked novels among regulars.
And yes, I hear your concern with Amazon. E-books are a negligible part of their business, though.  And yes, there are efforts to create alternatives going on. I know of a half dozen. But these things take time, and meanwhile writers got to eat.