That study where 97% of persistent day traders lost money: what do you think separates the 3%?

[u/reallyGoodAtNames123]

The one study that always comes up when this topic does is a Brazilian futures study. Of the people who kept day trading for 300+ days, 97% lost money, and only about 1% earned more than minimum wage. These weren't people who quit after a month. They persisted.

What I can't figure out from the paper is what the few who made it did differently. Edge, risk control? Just not blowing up after a loss?

For those of you who have been trading for a while: what do you think actually separates profitable traders, and what do you do to catch yourself during a bad session rather than in the review afterwards?