Here’s something that a philosopher, who I hold in high esteem, told me in a recent interaction:
There isn’t much a philosopher can teach others. Except perhaps what may be called critical thinking.
Though the nature of philosophy is itself an open question within philosophy, I tend broadly agree with this. Philosophy does not have a subject matter of its own, which philosophers may claim an expertise in. Socrates, the quintessential philosopher, did not consider himself an expert (“All I know is that I know nothing”.) But he was quite skilled in examining questions like ‘What is Knowledge?’, ‘What is love?’, ‘What is Virtue?’ with dogged persistence.