nothing. There is no way to predict the stock market. Even the way you're probably thinking of. Even the ones in the replies to this comment. Even the really basic ones and the really advanced ones.
This. If something "worked", then nobody would share it, or it's so popular that everyone has everyone applied it, and it doesn't work anymore.
The existence and success of the Millenium fund is a (probabilistic, to be fair) disproof of your assertion.
Tbf, I’ve had friends in finance describe the Millennium fund (now Medallion fund I think?) as operating in a very, very specific niche of the market. Probably helps that it’s limited to a very select group. Its extraordinary impressive for sure, but I don’t think it is widely applicable or comparable.
Outlying returns can be produced by pure chance, or also by cheating.