If your comprehensive credit score is insufficient, you can take the following measures to restore it:

1. Pay off overdue bills in a timely manner: Late repayments are the primary factor that reduces your credit score. If you have overdue bills, pay them off on time and make sure your credit history improves.

2. Maintain a good credit record: A good credit record is an important factor in improving your credit score. Using your credit card wisely, repaying it on time, and not maliciously defaulting will help you maintain a good credit record.

3. Appropriately increase the credit card limit: Appropriately increasing the credit card limit can improve your credit score, but be careful not to overuse the credit limit, otherwise it will have a negative impact on your credit score.

4. Increase loan types: The diversity of loan types will be considered when calculating credit scores. If you only have credit card or loan history, consider adding other loan types, such as installment payments.

5. Infrequently change bank cards or lending institutions: Frequently changing bank cards or lending institutions will affect your credit score, so it is recommended to minimize changes.

In short, establishing a beneficial credit record and complying with credit rules are the basis for improving your credit score. Depending on your credit score, taking appropriate steps can help.