In order to improve one should analyse one's losses deeply in order to identify what mistakes are being made.
The kind of losses that can help a lot are close games where one might not even know where one went wrong.
What is most frustrating to me is the way I lost/drew games. I am making basic errors against opponents 200 points below me. Although I try hard not to be overconfident against lower rated player's, I am having trouble not doing so. I don't make such errors against higher rated opponents as often. I have to learn to play chess and not pay attenting to my opponent. Like Fischer said "All that matters on the chessboard is good moves."
Round 1 - missed very basic moves at least twice. First giving up any advantage(27. Bg4?), then the game(46.Kb8???).
Round 4 - didn't look one move further in a forced sequence that threw a way my advantage.(19...Bxd3)
Round 5 - misplayed the opening, proceeded to weaken the q-side pawn structure, made no effort to activate my bad bishop. There were other psychological issues in this game as well. After losing the first round I was determined to win the next 4 games, but after drawing the 4th round you could say, "I had the wind blown from my sails". I probably should have not played the 5th round.