You should work on your games by analyzing it afterwards. There you can point out your weakness, the mistakes have been made and to never repeat them again. Look on the things that make you overestimate your attack and underestimate on your opponents. Then you can vastly increase your playing strength as it helps you know deep of your strength.
Many training methods are possible, but I suggest the most basic and effective way of improving your game.
Seeing and realising one's mistakes is no guarantee that they will not be repeated.
But then helps you play better in next games as your intuition might be well aware on situation where you make mistakes. We can't play a mistake-free game in chess but we can atleast lessen it.
USE TEH POWER OF HOUDINI, KOMODO AND STOCKFISH TO BEAT PLAYERS. COPY FEN OR PGN. ANALISE FOR A MIN, STOP, THEN PLAY THE MAIN LINE REKOMENDED TO BEAT OTHERS AT FAST CHESS.