I've learned that how a product is designed matters, because it affects the quality of someone else's time in ways you (the designer) may or may not be aware of. Some products make us happy while interacting with them and some others are just a pain to use. I think we should all strive to make products that others find delightful to use.
One recurring theme I've noticed is that for most of us, we are all learning how to spend money, time and energy in ways that serve our goals. I once heard this quote that money won't buy you everything but it will definitely buy you something, and I think for most of us, we are frequently learning what that "something" should be.
Somehow it seems the most important skill I should learn is to always show up. That's it. No magic formula or secret method. Always show up, irrespective of how I feel. Seems like that's really what adulthood is all about: showing up. The whole point is to show up.
It is easy to get stuck in a monotonous routine. We live through life without interacting with our world. We live a monotonous routine day after day, month after month, year after year. We will be better off if we realized: the world is not happening to us, we are happening to the world. So we should poke holes in our realities, question our beliefs, compliment strangers, do things outside our routines and most importantly, interact with our world.