As I mentioned earlier, excellent credit takes time. One way that you can use time to your advantage is by maximizing the impact of the "new credit" category of information, which makes up 10% of your FICO score. Obtaining or applying for new credit is generally seen as a risk factor by lenders, so the fewer items that can be considered new credit, the better.

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What can and DOES change is whether you have a collector pursuing you for the debt. If you are talking about a dormant account that has been in collections and has finally been left alone with no collections activity for a few years, messing with it can be problematic from the point of view that the collections people will start pestering you again to see if they can get money and if the SOL isn't up, they can start reporting on it again which can affect your score or they could even file suit if your state SOL isn't up.
If you are using a great deal of your available credit, it can count against you. Create a plan to pay down your debt a little faster. Honestly evaluate your expenses, and cut back. Use the money you save to reduce your debt. Try to get your credit utilization down to 30% or less. If you can reduce your debt, the credit utilization portion of your score will improve, and help your credit overall.

The best way to improve your score is to have good behavior reported every single month. For example, you can take out a secured credit card and use it monthly. Charge no more than 10% of the available credit limit, and pay the balance in full and on time every month. Your credit score will improve as your negative information ages and your credit report fills with positive information.
Credit scoring models usually take into account how much you owe compared to how much credit you have available, called your credit utilization rate or your balance-to-limit ratio. Basically it's the sum of all of your revolving debt (such as your credit card balances) divided by the total credit that is available to you (or the total of all your credit limits).
This is easier said than done, but reducing the amount that you owe is going to be a far more satisfying achievement than improving your credit score. The first thing you need to do is stop using your credit cards. Use your credit report to make a list of all of your accounts and then go online or check recent statements to determine how much you owe on each account and what interest rate they are charging you. Come up with a payment plan that puts most of your available budget for debt payments towards the highest interest cards first, while maintaining minimum payments on your other accounts.