The conventional wisdom for success with self-published books is pretty simple. People tend to do better when they are both good and prolific. However, not all writers are good, not all are prolific, and even fewer are both. (The intersection of any two overlapping sets is always smaller than either set on its own unless one set completely contains the other.)
Someone who writes ten good books a year is almost certainly better off with self-publishing, the reverse is likely true for someone who writes one good book every ten years.
There is no one answer for every author, and that is something that's changed in the last decade, because ten years ago self-publishing was far less viable than it is today.
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