INFJ is a common type for 9.
But I think it is more common for a 9 to be a P than a J.
But I am an 8 and it is more likely for an 8 to be an E than an I, but I'm fairly introverted.
So I would say that you keep taking different enneagram tests and see what results you come up with. Then average out the percentages from all the tests and see what your overall highest type is. That's how I discovered mine.