The only realistic solution I've seen so far is placing Japanese companies under foreign control.
Kioxia is an absurd example. It went from being Toshiba's rejected-and-dejected NAND flash division to a world leading company literally overnight once it was bought out by an American investment firm (Bain Capital).
On that note, Toshiba proper is in the process of getting bought out and chopped up by Japan Industrial Partners, which is really just a front for an American investment firm (Bain & Company) among others. Olympus also suffered the same fate several years ago.
Another is Sharp, which managed to claw back from bankruptcy once China/Taiwan (Foxconn) bought them out.
Yet another is Nissan, which became relevant on the world stage after getting effectively bought out by France (Renault, Carlos Ghosn). Nissan probably would have gone even bigger if Ghosn and Renault had succeeded in totally taking them over.
Even 7/11 (Seven & i Holdings) which was a rare reverse success story of Japanese management bailing out a failing American business is now in dire straits and risking a hostile takeover from a Canadian business (Couche-Tard).
Japan has the technology, engineers, and designers; what Japan doesn't have is an appropriate culture.
It's frustrating watching as a Japanese-American.