The Responsibility to Introduce Oneself
As we can see, the Prophet Joseph did the right thing to introduce himself, as it was his responsibility to declare his talent, his trustworthiness, integrity, science, and knowledge. How could everybody else become aware of his competency, had he not declared it himself? Once he declared this and others benefited from him, his righteousness became known through his actions. That is a great way to prove oneself.
It is upon every individual to announce his competency for any action and prove it. I also found myself responsible for informing you that I have a pure ethical morality, so you should know that these words are not with bad intentions. My only drive is the welfare and benefit of human beings and serving the creatures of the universe of unity.