A BookBub Partners interview with a seven-figure indie stresses systems over spikes - email funnels, audience growth, backlist promos - because revenue that sticks usually comes from compounding visibility, not one BookBub Featured Deal high.
The takeaway for mid-career authors: treat marketing like product operations. Launch week is a sprint; the business is the newsletter automations and ad tests you run when the blog tour is over.
(Shortened and summarised to avoid devaluing the source)