Honesty is the best policy...unless you are hiding Jews during the holocaust, negotiating, or comforting someone during times of great fear and stress. In those situations, honesty will get people killed, get you taken advantage of, or worry them more about things they cannot control. Like all ethics, openness and honesty are situational.
https://yourmeaninginlife.com/blog/the-ethics-of-honesty-and-openness
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