No matter what your talk is about, how you decide to start it will play a SIGNIFICANT role in capturing (and keeping!) the audience’s attention.
For context, the audience will not know what your talk is going to be about when you begin . You’ll only be given a warm introduction that teases who you are / what your talk is about without giving it away (i.e. Clarissa Cardenas was introduced only as “a music lover and experienced festivalgoer”; Fyre Festival wasn’t revealed until she mentioned it). So whatever the noteworthy details about you and your story are, know that you’ll have the element of surprise to use to your advantage.
Beyond that, one incredibly effective method for starting a presentation is to create an information “gap”. For example, one of Nick Gray‘s first lines was “tonight I’m going to talk about one particular party I threw that, while in the moment felt amazing, ultimately ruined my reputation for years to come”. This left the audience wondering “what exactly happened at that party”? “How did it result in a loss to his reputation”? Those unanswered questions earned Nick their full attention until they were answered.