Motivation and ambition are heavily intertwined, but there are a few differences between both nouns. Thus, the definition varies: motivation refers to the inner drive that drives us to action, while ambition refers specifically to the desire to succeed, make progress or achieve certain goals. Similarly, the focus varies; motivation focuses more on encouraging action and persistence, while ambition is aimed at achieving specific goals or obtaining success. 

In short, motivation focuses more on encouraging action and persistence, while ambition focuses on achieving specific goals or obtaining success. 

To stay motivated, it is sometimes necessary to adapt and change your approach when necessary. Sometimes circumstances can change and it is necessary to adjust your goals or strategies.