Impermanence seems like a terrible thing that you have to begrudgingly accept in life, but it's actually the only way that growth can occur (i.e., as your past self is no more) and so is necessary for you to find life worth living.
https://yourmeaninginlife.com/blog/the-seeming-paradox-of-impermanence
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