How can I get rehired after the seasonal period?

I work at American Eagle.. And I'm a seasonal employee and they flat out told us there's a very small chance we'll be rehired. They're hiring like 30 employees and keeping like 5 after the season. I REALLY want to be rehired because simply it's really fun to work there, the location is good for me, and ..I need money.

What can I do to improve on my work performance and like "sucking up" to my managers ahaha. (Which is super hard since I'm like.. real and I haven't done any sucking up for like years, that I can't even figure out how to do it)

I also have my age against me.. I'm 16 and like the youngest person there... I like think I'm the only 16 year old, and there's a small handful of people who are 17. Nearly everyone is in their like 3rd year of university.. Like no one judges me on that but I feel like they would prefer a univ. student just because of their more flexible availability

Any tips by people who managed to get rehired?