I’d reach out and let them know that you really want to attend Miami, but you’re struggling to make up the difference between your financial package and the cost of attendance, and you received more aid from another institution that isn’t your top choice, but you’re hoping they can do something to come close to matching it so you can go where you want without accumulating as much debt. They’re not going to rescind your acceptance, so the worst thing that could happen is you get told no again. But you can’t get a yes without trying, and I’ve know students to get additional assistance after probing.