So basically per the AMC brief, if you are to get promoted with a P to O-5 you need to have most of the following: PRF DP push, strat, CC push and SDE push along with consistent OPR strats and CC/DE pushes.
However, looking at the #s of people passed over it seems the things those people lacked the most were PRF strat, OPR strats, OPR CC pushes, and duties above wing. Those seemed to be the key, at least in AMC.