Mid-income authors ($1,001 – $2,500 and $2,501 – $5,000) tend to use a mix of backmatter links (placing signup links at the end of their books) and social media, though newsletter swaps with other authors are also common.
Higher-earning authors ($10,001 – $20,000 and More than $20,000) take a more diversified approach. They use backmatter links ,