I was in that state for a while too. For me, it was a highly limiting belief that was holding me back. And that belief was, "Nothing is important. Nothing exists. Everyone is being deluded into grandeur." Follow that with "Who's to say what's right for everyone? Who's to say what the true nature of reality is? Why should I believe what anyone says?"
So essentially, I didn't feel like doing anything since nothing was really worth it and even if other people gave me motivational advice I felt they were just deluding themselves. What got me out of it was a subtle, but important twist. I then asked, "Well who's to say that life ISN'T important?" Turn that limiting belief against itself. I was thinking clearly enough to see that even if other people don't know the true nature of reality, how do I know I do? And my answer was this, "I don't!"
Therefore, I shouldn't take any of the belief that nothing is worth it to heart. It was a really grueling time for me, fighting every moment and refusing to believe that life is simply just pointless (which at this stage is still a possibility, but not one I give much consideration to). Hope that may shed some insight