Being Happier by Design: A Practical Guide

Treats happiness as a skill with a baseline rather than a mood. The baseline is set by a small number of daily inputs, your body, your attention, who you're around, how much of the day you chose, and changing those inputs moves the baseline both ways. Sleep is the biggest single lever.

Gives the ordered working list: a consistent sleep window as your first appointment, twenty to thirty minutes of walking most days, pointing attention at what's working, and keeping the relationships that feed you. Closes with letting hard feelings out on your terms and the destination mistake.