I try to minimize the difference between what I do each moment and what, upon reflection, I wish I would do.
I track how often I make a mistake. I also have a phone app that tracks how long I use each app.
I did a silent, 10 days long meditation retreat.
I try to always tell the truth, be aligned with reality.
I write every day a few words about the good parts of my life.
I write every month a summary of the good life events for that month.