I am going to spend 3 months in a remote cabin (with an ice-cold stream for ice baths) working on my passion.
I am fluent in Chinese, Japanese, Korean, Cantonese and I also enjoy coding in c++.
What are some ideas for programming projects utilizing my knowledge of these languages?
Look, wanting to make a change is a healthy thing but most radical change decisions don't go anywhere. Start small and set yourself something concrete that you can achieve.
You could spend that time volunteering somewhere non-computer related. Interacting with a bunch of new people might also help you discover your passion.