Aks yourself questions.
What is the most interesting shit you can come up with, and keep asking about that as if you were a child, eventually you will find a question that captures your interest so much that you wont be able to stop thinking about it.
To make that happen, get comfortable, get some snaks, water, good low-fi trap to put yourself on the mood, pen and papper if you need it, and think, think hard.
