Job after graduation ( STEM major )

How can I increase my chances of getting accepted off the waitlist? I’m asking for a lot of aid and this school has one of the biggest waitlist. I have written some letters to show continued interest but I think it will be really tough for me to get in. Any advice? How can I lure them to accept me?
@“b@r!um” @happymomof1 @“aunt bea”