Hahaha, all that infinitely easier said than done. Backstabbing politics on treasonous politics. It never ends with these people “running” things. Right into WW3.
First step is for people to actually understand what is lost as tribes go extinct.
Worldviews which have developed for millennia each produce their own sciences. The melting pot destroys these. Not only destroys them but makes them 'selected against', so they are hard to recover.
Look at the Tibetans. They had a vast repertoire of esoteric disciplines, sciences, up to 50 years ago. Amazing things, some of which I've seen in Dharamsala and in neighboring areas. They are slowly eliminating their sciences so they don't become the property of conquering tribes.
Look at the wave pilots of the Marshall islands, one of many hidden sciences which are now not only lost but aggressively hidden so they are not recovered.
https://www.nytimes.com/2016/03/20/magazine/the-secrets-of-the-wave-pilots.html