how to pay for college if financial aid doesn't cover everything

UPDATE: I’ve been accepted to LSU. Yes I know LSU is more expensive. Some of my friends are saying it would be better for me going to LSU, because I can live with my cousin and commute to school. They said that I’d probably end up paying the same thing if I go to Nicholls or La tech because I have to pay for housing. This sounds about right. Also They’re offering me the pelican promise award which waives my registration fee and tuition for the 2019-2020 academic year. I’m waiting for everything to be verified so I can see my financial aid award (my pell grants and loans). If it helps Baton Rouge is an 1 hr- 45 mins away from home. My cousin stays in Baton Rouge and lives maybe 20-30 mins away from LSU. would this actually be better? and yes LSU has my major.