Try as you might to really give it some effort, your heart just isn’t in it. This is likely because you don’t think it will work out or you don’t think it’s really going anywhere. With that attitude, it won’t. Maybe it’s because people have not come through how they said they would, or maybe people are telling you that what you’re doing is silly or pointless. Don’t allow others to influence your actions. The best thing to do is to continue putting in all the effort you can muster until you find that you really believe in yourself and this project again.