That will not work, sorry to say.. It's not a matter of how much money you are earning from outside of Japan. The rules are very, very strict for getting a visa here. No local employer/sponsor, no working visa. Not sure what your skills are, but you could look at the recruitment agencies, like Robert Walters, who find work for foreigners in Japan, and in some cases you don't need to know how to speak Japanese. If you have a Japan based company sponsor, it's much easier. And at this moment, due to the Covid-19 crisis, the immigration offices are overwhelmed...... automatic extensions to working visas have been provided for those who have visas expiring in this period. I'm one of them.... and have a visa law office handling my renewal at this moment. Or you could think about enrolling in a Japanese language school, and get a work/study visa, which would allow you to spend a limited time in Japan, while you still work remote. Then you have time to explore other work possibilities.... Maintaining official visa status here means you have to show that you are paying national income tax, your local residence tax, national health insurance etc. It's super complicated when you are self employed. Hope this gives you another perspective....