In the short term, you can improve your credit score by lowering credit utilization ratio. (mybanktracker.com)
Two ways of lowering your credit utilization ratio are by reducing your credit card balance / spending and increasing your credit limit. (myfinancekits.com)
Pay off credit card debt: Reducing what you owe on your credit cards will lower your credit utilization ratio quickly, which is key to giving your credit score a boost. (nerdwallet.com)