This indeed can be frustrating. It might help to take a step back and see how the onsite went. a) Think hard about how the onsite interviews went. Did you get enough sleep and were you fresh ? How did you dress up ? Engineer roles are quite forgiving in these aspects, but product management roles need not be b) "Great candidate, wrong fit" is not necessarily an honest comment. Often it means, they did not think you were fit for the right role - but they didn't see any red flags so the comment is meant to allow you to apply for other positions. Often companies have blacklist of candidates [for example, if the interview went rather poorly, they cannot re-apply for a certain period of time]. c) Do you explicitly say "I hate my job" or give the vibes that you are desperately looking for a change ?

I suspect it may be your interview style and recommend asking a close confidante about it. For PM type role, it is more about the ability to influence and earning trust. Keep trying! We all have rough patches !