Well it's perhaps too late now. But I would have immigration and remigration policies that favoured people of white European heritage. And then have a more meritocratic society. That is more or less how America operated before WW2. Which was also when it was at its peak as a nation. Btw, if I was Japanese or Indian, I would favour native people via government policy too.
Discussion
"Indian" is like 200 different languages, and at least as many distinct "cultures".
Even "Japanese" includes multiple sub-ethnic groups. Who gets to be "favored"?
Let's not pretend that a white European or black African is running Japan. Come on now 😂 You are being deliberately obtuse at this point