So there's a few main things that need to be mentioned here that poet touched on:

A knight on the sides or the corner is an unhappy knight.  A sidelined knight can at BEST move 4 places, in the corner only 2.  Knights should always be centralized to be their most efficient (unless the position requires you to move your knight to the side or a corner for defending an attack or executing your own).

Activate those pieces!  At move 10 you've got no central pawns and your rooks are unconnected.  At 13 your offering unecessary Queen trades while you still have a Rook on a1. 

Don't trade off your good pieces for your opponent's bad ones.  10. Bxa6 was a waste of a perfectly good bishop for Hong Jin's silly knight on a6.  You should've continued developing, possibly with Re1 followed by Nd4 (hitting the light bishop on f5 and taking advantage of Hong's uncastled king and pinned e6 pawn).

Thanks for the advice. I can't keep playing this bad in these final rounds. The other rounds were very good by me. I definitely didn't deserve much cash. Ended up getting $14.29 since $100 4th place was split 7 ways.