Editing and marketing for self-publishing friends and family has accidentally become my hobby, so I'm filled with opinions and anecdotes. My husband writes military scifi/space opera and is currently writing Book 5. He's been moderately successful despite the fact that we've purposefully done many things on the cheap (like cover art, only just now engaging a professional artist to create covers for all five books in his series), but I think he's been successful for two reasons 1) quality of the story and 2) marketing. No advice on #1 for the OP, and since the OP is looking at non-fiction (although based on a personal experience story) my second example will be more relevant. But, for the marketing side, I cannot stress enough that dedicated website and extra content and a personal touch of engagement go a long way. He blogs about military history and personal Air Force experiences that inspired scenes, where character and ship names came from, and so forth. When someone sends him a comment on his site, he sends a personal and heartfelt response. He does have a Twitter account and Facebook author page, but honestly they are afterthoughts to the website. There are also a number of ebook promotion services out there, by far the most successful but also the most expensive being BookBub, but there are also some good free and low-cost resources as well. Again, in this area my experience is in fiction novels.
However, I also helped a friend edit and publish a non-fiction book in a very niche topic area and based on her personal story in weight loss through bariatric surgery. It seems sort of analogous situation to the OP, an author who had personal success in a life challenge and wanted to share. She published in both e-book and print-on-demand form (as my husband does). The book is marketed both through her life coaching focused website but also through speaking appearances at weight loss centers and other venues where her experience on personal change management is relevant. Again, she's got a good story and credibility in her field through personal success. For the OP, one way to maximize income on your book could be to engage in such niche venues, offering to speak at local libraries in college towns, for example, or wherever you can think of to get your book out there. There are also ebook promotional services that include non-fiction books... Buck Books comes to mind, but my gut says if you want to build a revenue stream you are going to have to put yourself out there.
Anyway, it sounds like the OP has a personal story to tell and a genuine interest to help others and that's a good foundation to write an ebook from. The website will go a long way in getting the word out. Think of tangential "extra" content you can put on the site that supports the book's content, not just regurgitates it. As for pricing strategies, in the two examples above, the strategies are very different. My husband's goal is to be a great value for a good story, and we price at $2.99 for most books, which is the lowest price point that Amazon pays 70% royalty (below that the royalty is 35%). We price Book 1 at $0.99 for low barrier to start the series. My friend's much shorter non-fiction self-help book is priced at $7.95 for the ebook and higher for the print book. But the book is primarily sold through engaging at speaking appearances and she has a more direct sales approach and a coaching business (in retirement) that it helps feed. So, part of pricing depends on goals and marketing approach.