What do you want him to notice you for?
Brains?
Health?
Boobage?
Legs?
Sexiness?
Talent?
Money?
Cooking ability?
Taste?
Dance moves?
Strength?
Why do you like him?
Generally, you want there to be a fit between the reasons you like him and the reasons he might choose to like you. What you need to do is get to know him. That means doing things with him.
It is traditional for women to set themselves up as a kind of honey trap for ants. Sex is often the lure. Dress provocatively and put yourself around him and give him pouty looks. Maybe he’s the kind of guy who would go for that.
But I would do my research on him first. Find out what he is into. And if he was into the same things I was, I would proceed. If not, I’d let someone else go after him because it does no good to capture a guy you aren’t going to like.