One has to respect oneself. Unless a person respects himself, he will not be respected or respected by other people. One has to do certain things to increase one's dignity.
In order to increase one's dignity, one must invest in himself. One of them is sports. Eating healthy and regular. Avoiding situations that make you feel worthless. Reading books, reading more books.
Doing outdoor sports and doing it because he wants to. Feeding pets. Doing this not because he feels valuable, but because he likes it.
Donate to charities. Doing it sincerely. Well, someone who does these kinds of things in the long run has no chance of feeling bad.