Meditating? Trying out a new workout regimen? New supplements? Set a baseline and track of how you feel over time with Tracker. Tracker is an easy way to log your mood and energy levels with Push Notifications or your Apple Watch. It supports sharing, JSON export for your own processing, and custom labels for experimentation.
Happiness is a weird thing and I think forcing yourself to reflect back on your day is a great idea. So every day AYHT will email or text you to ask how your day went. After responding, you can go to the site and see a complete history of how your days have went and that hopefully helps you direct your life.