Constant failure despite positive feedback

All I can say is your turn will come soon. There were likely four other candidates who also were rejected for that one role (remember that, likely one role available) wondering the same thing as you. The fact that you're getting there means you're qualified on paper. When a firm closes on a candidate versus other equals, you it can be due to culture, fit, maybe they see them as a better candidate for them. Maybe they see them doing banking for the long? Could be lots of reasons that you don't know.When I had this problem just like you, I took the pressure off myself and stopped interviewing desperately for a role. I stopped giving af about the outcome. I walked in interviewing the the interviewers (meaning, examining whether this opportunity was also right for me) and it made a difference in my mojo. I went from coming off as that desperate try hard who is "whiling to do whatever it takes to do the job" and changed my outlook. I realized that even though my intentions were good it didn't raise my value as a candidate. I'm not saying you have this issue, but likely you need to do things differently. If you're getting the same results over and over again, it's time to use that sample size as an opportunity to reflect on your performances in those interviews. This doesn't even mean examine your technicals because that's a right or wrong answer, but examine how you're behaving in those interviews and what your energy tells your employers. Are you telling them that you're a confident person who is abundant in the opportunities that are present? Or are you telling them that you're desperate for a job and would take any investment banking offer you'll get? Think hard, only you know.Good luck!