I absolutely hate this concept. It's trite life advice wrapped up in self-serving orientalism/ethnic exceptionalism.
It literally just boils down to "if you find life meaningless, just find some mundane thing and invest it with meaning for yourself", and somehow I'm supposed to be wowed by an aenemic, EILIF version of Nietzche. Literal "Place" vs "Place, Japan" meme.
Why do you think Japan has so much suicide? Because all anybody has to say to anybody is "ganbattene~". Some people run out of "ganbari"? "Ganbattene~~".