Who are in your opinion these
∼1% of traders? Why they are able to remain profitable? Are you sure you are one of them, if you include taxes, fees, etc.?

In my opinion, the 1% traders that remain profitable are traders who are passionate about trading crypto, who always learn from their previous mistake, control their emotions, never panic sell, have a reasonable stop loss strategy, never follow hype and know how to select good coins.
Yes. They are those traders who are not afraid of losing anymore since they are already used to it. But since they have been in the crypto market for such a long time, i think they have developed already their special skills and strategies in trading that helps them to maximize profits over losses. And lastly, they are those traders whose traders of the present time are not.