Supervisor does not give a research project
Now that you've written three papers, you've shown you can solve problems. But you still need to learn the other important side of research: coming up with problems to solve. We can't know your advisor's motives with certainty, but I would guess he expects you to spread your wings and become more independent. Instead of asking him for projects, I suggest coming to him with project ideas of your own, and asking what he thinks.