Suppose you were god. What's the purposes of miracles?

Like turning walking sticks into snakes, or turning loaves into fishes, or letting people walk who had previously been unable to, or showing your face in a piece of french toast.

Is it showing off? Is it to scare people? Is it to make people believe that you’re a magician? Or is it purely for your (god’s) amusement?

What’s the tactical reason for performing miracles? What does god get out of it?