realistically? tariffs food production is a national security issue and needs to be treated as such. this means higher grocery prices, but at least farmers and fishermen can survive.  tourism helps to an extent, but domestic tourism is dead compared to the past and thats not coming back. japan is isolated geographically from the west, which makes turning it into a tourist hotspot like france difficult (and even if they did, a tourism based economy is bad for several reasons).
Japan