Stopped trying to figure out to what "level" the market is going, and now just pay attention to what it is doing, and try to get a piece of it.
Backtest using objective rules and only trade positive expectancy setups with discipline and solid management.
Learn to Program, then back test 10 to 50 years for day trading/long term trading if possible as some markets were not around 50 years ago, more you know what back tests show, more you can accept or decline.
A setup at the daily low and daily high; compare higher (lower) low and higher (lower) high with previous day(s) to identify the market sentiment; patience until prices reach daily low and daily high
What's the single thing you've done that's improved your results?" A setup? Market awareness? Patience?" Narrowing down trading success to a "single thing" is kind of impossible -- trading is such a somewhat complex and dynamic thing. ..that it's rather a series of different things that led me to where I am now. Saying one thing only wouldn't do no one justice. That's like building a Ferrari...but only remembering to use three wheels. or forgetting to bolt down the seat or steering wheel down securely.
Do you use the previous days high/low from the regular pit session or do you include the Globex high/low?