It is difficult to separate human ethical behavior from the random events of the universe, but the world does not keep track of your good deeds and respond in kind. Rather, it's people who choose to reciprocate based on your behavior, and it's your beliefs that influence how you perceive and respond to events.
https://yourmeaninginlife.com/blog/why-bad-things-happen-to-good-people
The problem with any behavior is whether someone unwillingly is harmed or pays the cost of another person’s behavior—not who benefits. Therefore, both selfishness and altruism can be bad if it someone else ends up being harmed or paying for it.
https://yourmeaninginlife.com/blog/non-consensual-harm-or-expense-vs-the-greater-good
You don't have to save the world; your life and world get better one day at a time with every constructive act you take.
https://yourmeaninginlife.com/blog/you-dont-have-to-save-the-world
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