Get yourself born in a rich family
There's no secret to success. Anyone who says otherwise is either trying to con you or is delusional himself. Though there are characteristics that help provide success: luck, persistence, talent and social skills. Don't make it a goal to become a millionaire. Find ways to provide services that people will pay you for, and maybe you'll become a millionaire. Focus on the services you provide, rather than the money it brings in. People are happy to pay those who genuinely care about them.