Start with high-confidence managing emotions books, then narrow by subgenre or adjacent topics.
Atlas of the Heart
Brené Brown, Gavin Aung Than
The Relationship Cure
John Gottman, John M. Gottman
A Liberated Mind
Steven C. Hayes PhD, Steven C. Hayes
The Highly Sensitive Person
Elaine N. Aron
Change Your Brain, Change Your Life
Daniel G. Amen M.D., Daniel G. Amen
Self Help
Gabrielle Bernstein, Richard C. Schwartz - foreword
Emotional Agility
Susan David
Navigating Grief Workbook
Anna Darbonne PsyD
Hardcore Grief Recovery
Steve Case, Steven L. Case
Looking After Your Autistic Self
Niamh Garvey