Thanks for your answer.
I mostly agree per the context here, although I see the latter of your point #3 to come from elsewhere.
I also see your point #2 to be the key to the humility spoken of here. It immediately follows the statement re: the humble. And 7a & 10a seem to be making this more clear - Submit to God - Humble yourselves before the Lord.
Humiltiy is found/evidenced in submission/obedience to God/the Lord & thus resisiting His adversary instead of submitting to him.
Drawing near to God is cleansing your sin & mourning over it.
Thus, the humilty here seems to me to be mainly in the obedience to God commanded in 7a & [possibily chiastically] stated in the command language of 10a.
The rewarded exaltation would be the result of His Grace which provided the Obedient/Humble Christian the training & ability to come to the exalted position (drawing from Titus & Rom, et.al.).
Humility before God seems mainly to be found in Obedience to Him, as most great words & truths in Scripture are that pertain to us.