I have a couple of books that are something between self-help and neuroscience/psychology that I can recommend. They are a more scientific and evidence-based lens on many of the same themes as self-help books (resilience, confidence, acceptance, etc), and they contain concrete exercises and summaries. They might appeal to people who are allergic to woo:

- Buddha’s Brain: The Practical Neuroscience of Happiness, Love, Wisdom

- Bouncing Back: Rewiring Your Brain for Maximum Resilience and Well-being