Can a fortune teller tell his own fortune?

Some fortune tellers also tell their own fortune. For example, Ren Tieqiao, who annotated the Essence of Heaven, simply recognized his eight characters and wrote them in his own book as an example. Why did the master tell his own fortune? When he was young, he couldn't tell his fortune himself, so he went to find someone else to do the math. After receiving his money, they praised him blindly. He also thought that if he studied hard, he would be able to get fame and fortune in the future, and the financial officer would be honored! Later, he was able to count the eight characters, only to find that he was really not an official's eight characters; So I have no choice but to become a fortune teller!