You should generally live your life ethically and to the fullest regardless of what happens when you die; you should also at least try to work toward major goals that you have and make choices that shape your life into what you wish it to be.
https://yourmeaninginlife.com/blog/the-implications-of-not-knowing-what-happens-when-you-die
You can always find a reason to complain, and you can always find a reason to be grateful. The former will lead to a miserable life; the latter will lead to a more pleasant life.
https://yourmeaninginlife.com/blog/it-will-always-be-something
There are many misconceptions about how important growth is to your life, from what kinds of growth are possible, whose growth is meaningful, and how growth is meaningful even in the face of endings and death.
https://yourmeaninginlife.com/blog/misconceptions-about-growth-oriented-meaning