A pulse..Just joking F/M every year has unfilled seats so I think the chances of matching are in your favor.. GL
Exactly, a pulse. Unfortunately, not every med student has one.
The question really should be: what does it take to be ranked-to-match. I think a pulse (or non-damaging application) will get you middle/bottom of the list.
To start, on paper, good board scores, good grades, decent recommendations, good school that's known to train well. There's a tolerance for less-than-good because FM broadly speaking doesn't fill, but individual FM programs do pass people over. There's a lot to learn in FM and while these aren't perfect markers, to a certain extent they illustrate your fund of knowledge that you need to build your clinical acumen. Plus, they also show your ability to prepare and your ability to perform. All things equal, I think people prefer high marks compared to low marks.
Off paper, a "quick study", a likable personality, someone who's articulate are basic things we all look for. Beyond that, a good team player who has an ability to lead, intellectually curious, involved candidate.
The students who do well in interviews tend to be "interesting" people. I'll let you figure out what that means. Everyone has a different definition of what constitutes interesting, but my bias is towards someone who's done something cool during their medical career, or something unusually well, or is passionate about something in medicine.
At the end of the day, realize that FM is a diverse field with people doing a whole bunch of different things. Programs across the country are equally diverse. As a result, unlike derm/rads/ortho or whatever, there's no cookie-cutter "formula". In my opinion, FM is the only field that embraces people's individualism. If you took away payment issues, FM is one of the most satisfying jobs out there, I think, because it allows you to be an individual.
In my opinion, the most competitive applicants are those who show they can do the work but also allow their individualism to shine through their application.