[eddsh]

Chat to your doctor about this, sounds like it may be ‘proper’ depression and they’ll be able to give you advice to tackle it. Maybe you aren’t but talking it through early and catching it early is best :)

A life lesson I learned was to ensure your personal life is as satisfying as your work life so when one tanks you have the other. Make sure your mental model of yourself is >than just ‘software developer’. Learning Japanese sounds healthy :)

On a productive note, if you want work look at Python. There’s tons of remote Python roles and it has some ML elements your maths knowledge will help with.