The plan
Decide to escape degenerate society and create a master race
Buy up a bunch of farmland for self sufficiency
Bring chicks with good values, monogamous marriage starting very early
All wives produce 3-8 babies
Kids work, get strong, while also learning
Kids marry early to locals with similar mindset, by 30 they have half a dozen babies
People learn on the job starting early, no sitting around studying useless theory. No liberal college brainwashing
Most kids tour degenerate society for a few months after puberty, most don't like what they see, only the degenerate and weak leave
Ban conspicuous consumption, consumerism, or other degrading ideologies
Shun divisive media, Tinder, technology, etc. to focus on raising and providing for your family
Your population grows at least 10x every century. That's 1000x per 300 years, one billion x or more per millennium.
Plus 10-20% of your offspring and going out to colonize mainstream society along the way.
And there's no welfare or safety net, only the best can provide for large families, and the most degenerate leave your society, so you naturally cull out a master race
You are part of a eugenic master race that will overtake the world population quite rapidly
(be Amish, conquer the USA)