What if I can't travel to Japan and can't speak Japanese and English?

It is best to join a tour group, because it will be more difficult to travel without a language barrier, or it will be more convenient to find a local escort as a tour guide, communicate and travel. If you don't want to, then now the technology is so advanced that many translation softwares can communicate. It's best to do a good job in advance and know clearly what methods can be used to solve the problem when communication is impossible.

Or find a friend who knows English or Japanese to accompany you, then you will be much more relaxed.