To improve a credit score fast, key strategies include paying bills on time, especially credit card bills, to avoid late payments which heavily impact scores. Paying down existing credit card debt to lower credit utilization (ideally below 30%) can quickly boost scores. Keeping older credit card accounts open helps maintain credit history length, which is important for scoring. Additionally, requesting a credit limit increase can lower utilization ratio further if balances stay the same. Reviewing credit reports to dispute errors can also result in quick gains if inaccuracies are removed. Setting up automatic payments helps avoid missed payments. Avoid applying for multiple new credit accounts in a short period to prevent multiple hard inquiries that can lower scores. Using services like Experian Boost to add utility and rent payments might provide an instant score lift. Fast score improvement services exist but can be costly and should be used cautiously. Overall, good payment habits combined with lowering debt and correcting errors are the best ways to improve credit quickly.