Teaching English in Shanghai
If your English is good enough to follow discussions on this site you can get a job teaching English in Shanghai. If you can participate meaningfully you are frankly overqualified. I am currently saving about 2,000 dollars a month working approximately 9-5 every day. The minimum legal requirements to teach...
As far as I know student visas can be extended indefinitely. Being on your second tourist visa is okay, on your third risky and your fourth they will not extend it. I'm sure if you're actually travelling it'd be different but if you're obviously resident on a tourist visa they don't like it.