When you get to the end of your life, old and tired, and you look back on all the things you did and time you spent, what will make you say: yes, I did well and it was all worth it?
Put another way, if you have an extra hour tomorrow with nothing planned, what could you do with yourself to later say: I’m glad I did that? What if you have an unplanned day? Or a week? Does how you use that time change? Would the choice of how to use that time be more or less deliberate, depending on how long you have? Does that choice define you as a person?
One thing I've learned about living well is that there are many many many different aspects and it isn't just about what you produce in your limited time here. Treating yourself well and with compassion is so important. Taking care of your physical form frees you to live even more well for longer.
The thing that I learned that has had the greatest effect on me is living authentically to myself. When you don't live authentically, you deny core aspects of your being. Everything you do is a facade regardless of your intentions. Not everyone has this problem, but if you want to know that you've lived your life well, this is mandatory.