Guidance:
How to leverage someone else's platform without being smarmy by Kirsten Oliphant:
https://www.janefriedman.com/leverage-someone-elses-platform/
How to reach out to influencers for book promotion by Shayla Raquel:
https://www.janefriedman.com/how-to-reach-out-to-influencers-for-book-promotion/
How to find and reach influencers by Angela Ackerman:
https://www.janefriedman.com/how-find-reach-influencers-help-promote-your-book/
How to harness community to build book sales:
https://www.janefriedman.com/how-to-harness-community-to-build-book-sales-and-platform/