The highest IQ Whites start using their noggin to question the "Hitler is bad" meme
Then they, eventually, reform national socialism or something approximating it (traditionalism, rural living, self reliance and self sustainability).
At the same time the lower quality Whites destroy themselves (race mixing, feminism, drug misuse, too much videogames and hedonistic pursuits, bad diets LIKE HUEL, not enough focus on families)
^ Has a eugenic effect
Meanwhile niggers, shitskins and chinks are breeding out of control (r selection strategy) (dysgenic effect)
Various social collapses happen 2020 onward (BLM and CHAZ), White people, cut off from the rest via White flight, prosper
= White people return to dominate the world 2040-2050+
Those are my ideas.