Pick one high-intent sub-niche and make it unambiguous on the cover
Use a subtitle that mirrors what buyers type when they are scared or overwhelmed. For example: “A 4-Week Strength Plan for Women 50+ After Low Back Pain (With Form Cues and Progressions)” or “Sleep Reset for Shift Workers: CBT-I Style Habits and a 30-Day Plan.” In Health & Wellness, vague titles (“Healthy Sleep,” “Better Fitness”) get buried because shoppers search specific problems. Route rule: commit to either (A) protocol/behavior change with light clinical claims, or (B) evidence summary with careful citations and neutral language. If you cannot support a claim with your expertise, your book should be framed as what helped you and how you approached it, not as medical treatment. Put that scope statement into your introduction and disclaimers so readers know what kind of help they are getting before purchase.