Take a look at your main character. What is so special about them?
Think about it.
Something is special.
Small clarification: That special something does not include superpowers (if they have them). I mean that part of them that is inherently good / the reason they are able to push past their fear / that thing that makes them a hero. For example: Superman has superpowers, but that is what makes him remarkable, not what makes him special. His desire to help those in need makes him special.
Think about a friend of yours. A newly acquired friend. One where you can remember the moment you decided you liked them. When was that moment?
Was it the moment you realized they had beautiful, shining hair that rippled in the breeze? The day they wore an amazingly fashionable outfit to work? The time they recounted what they did over the weekend with people you don't know.
I bet it wasn't.
I bet it was the moment they showed something about their character that you admired or could relate to. They expressed interest in a charity or they recommended a book for you to read and it was already your favorite or they endured kryptonite to save a cat from a burning building. Sometimes there are a few little moments before you can make up your mind. Every now and then, all you need is one big one.
In a novel, the clock is ticking. The reader needs a reason to be interested in your main character. It is up to you to provide that reason. Early. As in, during the first chapter. The first pages.
Give your character an opportunity to prove themselves. To show who they really are. A big opportunity.
The world's best opening sentence is a great goal, but keep this in mind: Your reader wants more than a good pick-up line. They want someone to care about. A reason to read.
Give them that reason.