People that come to Japan usually follow one of 2 job paths: teaching English or work in tech. If you can’t work in tech then you probably won’t have a good time. It’ll be a lot to adjust to and teaching pay is not good. Many people leave. The older you are the harder to adjust I think (just from what I’m hearing). I came here with my wife and we both spoke English and still do. It wasn’t as much to adjust to for me. And I don’t work a teaching job obviously.