Keep the first secured credit card you received, even if you don’t use it later. This card will establish the length of your credit history. Most people choose a no-fee rewards card or a bank credit card as their first credit account, so it doesn’t cost anything to keep the card for the length of your history. You can see a list of good no-fee rewards cards here.
Especially if you’ve had good enough credit to open an elite credit card with an excellent rewards program, it makes sense that some of your very first credit accounts are collecting dust. It might seem financially responsible to clean house financially and close some of your older or neglected credit accounts, but consider this: your oldest accounts are also your greatest and longest source of credit history. If you close them, the pool of information that dictates your credit score will shrink, making you more vulnerable to credit report dings.
Are you saying you are an authorized user (not sure what you mean by “secondary”)? If you were an authorized user, all you need do is call the credit card issuer and ask to be removed from the card. If you mean you were a joint user or co-signer, then you may be responsible for the debt. If you were an authorized user and have yourself removed from the account, your credit score should return to its earlier levels.
The two biggest factors in your score are payment history and credit utilization (how much of your available credit you're using). That’s why they come first in this list of ways to boost your credit: Pay all your bills, not just credit cards, on time. You don't want late payments or worse, a debt collection or legal judgment against you, on your credit reports. Keep the balance on each credit card at 30% of your available credit or lower. Keep accounts open and active if possible; that will help your length of payment history and credit utilization. Avoid opening too many new accounts at once; new accounts lower your average account age. Check your credit report and dispute any errors you find. It pays to monitor your score over time. Always check the same score — otherwise, it's like trying to monitor your weight on different scales — and use the methods outlined above to build whichever score you track. And like weight, your score may fluctuate. As long as you keep it in a healthy range, those variations won't have a major impact on your financial well-being.
A credit report includes information on where you live, how you pay your bills, and whether you’ve been sued or have filed for bankruptcy. Nationwide credit reporting companies sell the information in your report to creditors, insurers, employers, and other businesses that use it to evaluate your applications for credit, insurance, employment, or renting a home.