An inability to find motivation is extremely common - the usual solutions are distraction (for the masses) or careerism (for the elite).
The deep problem is that most people are exogenous (not endogenous) personalities - their drives, evaluations, motivations, purposes etc. come from outside, from society, from other people; and society is not providing motivations.
Why not? Because society is secular and the public sphere (whether in school or college, or in the mass media, or in conversations between friends) does not describe life as having any purpose or meaning or any special role for us as individuals.
All that people pick-up is that life is about seeking happiness or satisfactions, or doing stimulating or cool things - enjoying oneself.
But these are just short term psycho-physical responses, and they do not motivate, they do not provide a shape or direction - indeed quite the opposite, because a life conceptualized in terms of achieving pleasurable short-term responses will repeatedly derail and sabotage any long term purposes or understandings.
It is hard to avoid the conclusion that spiritual reform is not only vital, but urgent; and ought to be each persons first priority today -- because without it, lacking it, there cannot be any progress at all towards anything better -- at most we might steel ourselves to a few hours or days of resolute motivation in a particular direction... until some chance emerges of something pleasurable now - at which point the quest is abandoned.