Last week I released a new book in a new series (contemporary western romance set on a horse stud/breeding farm). I have a preorder in the back for the next book which is coming out in October or November. I know that the general advice is not to do ads on a single book because you need the read through to actually make money.
I fear that if I don't do any advertising this release will just be as stagnant as the eight books before it. (I have another series which is stand alone books, no recurring characters or places, the only commonality is it is set in Australia.)
Does that advice about not advertising if you only have a single book in a series still stand?