All convincing speakers must perfect the art of persuasion.
Someone who has perfected the art of persuasion would be highly skilled at convincing people of different things.
???? On whatever you just wrote
"<span>In </span>Hamlet<span>, the </span>tragic<span> flaw determines his downfall in the play. And his </span>tragic<span> flaw is his indecisiveness that is due to grave thinking on the topic of whether vengeance is wrong or right, and whether to kill his father's murderer or not."
This may be helpful. </span>