What’s most important is maintaining good financial habits and responsibly managing your overall financial health. Focus on the key factors that make this possible such as paying bills on time, not using too much credit, and applying for and opening credit only when you need it.
Even if you’ve missed payments in the past, stop the bleeding, and stay current. Keep in mind, the information within your credit reports is what’s used to calculate your FICO scores. If you can make a commitment to change old credit habits, the impact from the past will fade over time.