You can get approved for a Milestone Mastercard based on your on-time monthly payments your bills (credit cards and loans). You should definitely wait until your credit scores climb higher around 650 to start thinking about applying for a new credit card.
You need to avoid hard inquiries from lenders or financial banking services because you get penalized by FICO and VantageScore 3.0 when these lenders report your financial activities to the 3-credit bureaus: Transunion, Equifax, and Experian.
What I've been learning about credit scores, credit report history, and creditworthiness has been very helpful and useful in my bold decision and hopeful quest to improve my credit. To improve my credit score, I've learned about the following:
1. Payment history: Pay my bills on time every month, (although I can't pay them all in full at once). Do not miss a payment!
2. Credit utilization: Use my credit less. Only make a purchase I really need, not want,
3. Account/Credit age: Do not close credit cards or bank accounts unless they're comprised. The older your credit age, the better,
4. Account diversity/mix or types of credit: Have not only credit cards, but an auto/car loan, a student loan (if not yet paid in full) and a mortgage loan,
5. Hard credit inquiries: Do not apply for than 2 credit cards or loans within a short period of time which would 12 months.
Another thing you should consider is a secured credit card which is said to have no impact on one's credit score. Look for pre-approved credit cards from the mail and online. Stay positive and take a good risk!