Once you resolve issues on your credit report, it’s time to implement a strategy to start improving your credit score. The single best thing that you can do to improve your credit score is to pay current accounts on time and in full every single month. You can picture it as burying negative information under a mountain of positive credit information.
You may also be able to negotiate with creditors as part of a "goodwill adjustment." They may be willing to remove late payments that they've reported to the credit bureaus, especially if you have a history of on-time payments. While you're trying to fix your credit, don't neglect your current obligations. Whatever you do, be sure to pay all your bills on time so you don't accrue any more negative items on your report.