You can’t lose. Verbally requesting a price reduction doesn’t give the seller the right to keep your earnest money and cancel the deal. The seller has the right to say “yes” or “no”.
If the seller says “yes”, you win. If the seller says “no”, the deal goes forward as negotiated.
How can you lose? You have a signed contract with a fixed price and terms. The seller may think you’re a crummy weasel but who cares? You’ll never see them again.