Every political victory is preceded by a cultural victory. A pro-white (and, especially, anti-Jewish) ideology will have to become the dominant force in american society before a White Nationalist can even be elected, let alone govern effectively. Trump was elected without a majoritarian cultural base, which is why he was relentlessly sabotaged and couldn't deliver even the most basic milketoast promises. Same thing for the woke left. As long as there is no clear cultural majority, nothing significant will change, neither to the left nor to the right.

Provided a pro-White, or at least Jew-aware majority can be created, I'd say the most important thing by far would be launching an all-out assault on jewish dominance of institutions and ESPECIALLY universities. Most of the west's problems are downstream from the fact that a hostile elite has hijacked many of the levers of power and used them to burst a hole in culture. Establishing quotas could be a first step on that front.

There is reason to be whitepilled about this possibility, as a substantial portion of ethnic minorities could also be coopted by a hypothetical anti-jewish coalition. Initially, we will need to compromise on many of the more racially-oriented stuff and focus on the root cause (Jews) instead of directly fighting the effects (anti-whiteness and replacement) and alienating potential non-white, anti-jewish support.