To swiftly improve your credit rating, start by obtaining a copy of your credit report to identify any errors or discrepancies. Next, focus on paying off outstanding debts, prioritizing those with the highest interest rates first. Additionally, consider contacting creditors to negotiate payment plans or settlements. Another effective strategy is to increase your credit limit or become an authorized user on a family member's account with a positive payment history. Lastly, refrain from opening new accounts unnecessarily and maintain a low credit utilization ratio. By implementing these steps diligently, you can expedite the process of repairing your credit rating.