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How to get a down payment for your next home?  Use current home as the down payment on the new one?
I know you've clarified that you're in the US, but in case anyone else comes across this question: in the UK this is completely normal (including if you still have outstanding mortgage on your current home). We end up with long "chains" of buyers and sellers all completing / moving on the same day so that the proceeds from one sale can be used as the downpayment on the next.