Everybody gets a case of the Mondays sometimes (even if it's Wednesday), and can't quite push themselves enough to get something done. It turns out, though, that ways to be more motivated when you want to achieve something, whether it's committing to practicing your Italian or finally finishing that screenplay, is all a matter of psychology. And it's entirely possible to maximize your motivation levels like a video game character, without needing to solve a puzzle or defeat a baddie to do it.
All of us have strategies we use to get things done over the long term, whether we use positive emotions (looking forward to the end result), fear, guilt, or something else. And, partly because we live in a capitalist society that often depends on individual effort, there's been a lot of research over the centuries on motivation and how it functions. The Protestant work ethic that emerged in Europe after the Reformation, according to some historians, is what drove capitalism forward, by making people motivated to work hard and deny themselves pleasure because that was how you earned eternal salvation. These days, if we find ourselves feeling unmotivated, research says it's just a matter of using our brains to feel our motivation soar again.