People begin to become successful the minute they decide to be.
No company has a permanent consumer franchise. No one has the only game in town. The never-ending cycle of destruction and change inherent in a capitalist economy always provides new opportunities for those with determination, goals and concentration.
I've known entrepreneurs who were not great salespeople, or didn't know how to code, or were not particularly charismatic leaders. But I don't know of any entrepreneurs who have achieved any level of success without persistence and determination.