When you adopt an internal locus of control, you put yourself in the driver's seat of your life. If you maintain an external locus of control, at best you are helpless to others and, at worst, you try to petition authorities to control others for you.
https://yourmeaninginlife.com/blog/the-value-of-an-internal-locus-of-control
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