A Short Summary of Big Picture Alternatives for Whites:

seasteading
Pros: good for protecting children from destructive mass cultures. If done properly with difficult initiations and proper training, an esprit de corps develops. Cons: expensive, boring, crowded. Poor self-defense. Dependent on shore supplies. Some individuals will act stir crazy. Not a good idea.

separate lives or villages within present states
Pros: easier to adopt, less alienation. Cons: at the mercy of tyrannical political whims from  multicultural populations, forced to work for and pay taxes in support of people seeking your destruction, that is, supporting their evolutionary and unethical egoism.

unilateral secessions
Pros: many. Con: police states responding to unilateral secessions with sanctions and aggressive violence.

purchasing land from existing poor countries for settling
Pro: less expensive land. Cons: difficult to find sellers, nonwhites will eventually break deals. Terrible idea.

leaving Earth 
Pros: greater safety from multicultural aggression, greater freedom to implement preferred societies. Cons: currently too expensive and technologically unfeasible.

paying nonwhites to leave the West 
Pros: many. Cons: expensive and politically unfeasible for now.

negotiated single secession
Pros: larger population for defense, economics of scale. Cons: free rider problems in a large nation. It would probably be dominated by present powers. If Texas seceded, for example, multicultural neoconservatives like Ted Cruz and Rick Perry dominate in the short run. Marxism will dominate in the long run.

negotiated multiple secessions
Pros: multiple experiments in living, less ideological strife, less alienation as whites find groups that fit their views, ability to develop esprit de corps. Cons: worse economics of scale, fewer citizens for self-defense. Counter argument: nuclear weapons would lesson need for large militaries.

encourage extreme multiculturalism now while whites still have a large enough population, leading to a great awakening among whites (the worse now, the better in the long run)

Pros: many. Cons: difficult to pull off, might lead to fascism. Many whites are so fanatically committed to groupthink, hedonism, and individual self-interest they might never experience an ethical awakening.

convert to Islam 

Pro: reduces power of Marxian feminism. Cons: implements a vile form of patriarchy. Nonwhite self-aggrandizement and self-justification is based in large part on misguided hatred of whites. "Hello, fellow Islamic multiculturalists," will look like an obvious ruse and won't significantly reduce their hatred of whites. Islam destroys ethical character, including via gene and culture co-evolution.

continue slow death with the occasional destructive lashing out gesture until multiculturalists believe they have enough power to engage in massacres, as in Zimbabwe, South Africa, the Ottoman Empire, and elsewhere 
Pros: few. Cons: loss of self, progress, and posterity. The worst evil in human history.

combinations of the above

other
several more I can't think of at the moment.