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I'm sorry to hear that dude =\ Hopefully Tesla will be receptive. Otherwise you may have to get it try reselling it? Dunno how resale is on the model 3.
"Thanks everyone for your responses. Greatly appreciate the suggestions. Tesla agreed to just cancel the reservation and refund me the deposit. I won't have to go through the hoops of looking for a buyer now."
If they refuse (and it would be their right to do so) your best bet would be to either eat the $3500 or keep the car (or a lesser configuration). Attempting to re-sell would mean taking on a lot more risk.
Directly from that order agreement: "Your Order Payment is fully refundable only until your order is matched to a Vehicle, at which point it becomes nonrefundable."
You will need to call, wait on hold for 2 hours, and ask to cancel. Hopefully they allow you.