I wonder if.......

As I prepare for IVF #3 emotionally. I wonder if I should have seen another reproductive endocrinologist for a second opinion? I wonder if that would matter? Our current RE has over 25 years of experience. He seems to know what he's doing, but has not been successful with us. He acted like we were a slam dunk when we first met him. I wonder if someone else would be able to offer us another strategy? More insight? More advice? I just wonder if our RE is missing something or if this whole process is just trial and error?