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If you paid your balance down to $500, that would bring your utilization to under 30% which is considered good, but if you got it down to under $180 youd see the most improvement in your score. How much depends on what your credit report looks like so YMMV.
OP, you'd have to list out all of your cards with their balances and limits if you want a solid answer. We don't know if this Discover card is your only revolver, or if you have a bunch. The answer to that can mean the difference between a 5-10 point change or a 50-70 point change when talking a reported balance change on the Discover card.

















