When I think about rappers that have made it and have prosperous careers or careers that are in the process of growing I think of the following:
J Cole

Azealia Banks

Big Sean

Nicki Minaj

Asap Rocky

New artists of the new generation and I wanted to know what made their careers blow and become prosperous ?
Was it a one hit ?
Them having a new sound ?
Cross over appeal ?
for advice for someone wanting to become a rapper as successful as the names mentioned what would you say or suppose or tell them to keep in mind and remember ?