You're asking for a quick fix without knowing what the problem is. Lack of motivation is normally a sign of some other problem. If the problem is that you just

You're asking for a quick fix without knowing what the problem is. Lack of motivation is normally a sign of some other problem. If the problem is that you just don't like the work any more, maybe the only fix is not just a new job but a career change. If the problem is the project/manager/team then it might be possible to move to another team in the same company. If the problem is that you haven't taken any significant vacation in 5 years...