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The lowering of your credit card limit increases your utilization score, meaning your credit balance to limit ratio. In increasing your utilization score, this can have a negative impact on your credit score by 20-40 points or so, depending on the rest of your credit and assets. In order to change the utilization score and raise your score back, you would have to pay more down on the credit card so that you lower that utilization score which would bring back your credit score as well.
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