"Hitting ones stride" has the sense of starting slow, but ramping up to full speed. It's common to talk about execs hitting their stride after a decade or two of experience.
On a shorter timeframe, it's also common in sales management to talk about new sales people ramping up to full productivity. For example, depending on the industry it may take an enterprise sales professional between 3 and 12 months to reach full productivity.
You could say "become very successful", but I've just not heard it described that way in a business setting.