I can speak Chinese but can't read or write well enough to teach. I haven't used the Chinese language in any formal capacity (i.e. reading a newspaper or writing a letter) for almost 40 years. The only time I use Chinese is when I speak to my family members. I use only English in ALL the jobs I've had in the past 30 years.
I have a BA degree and a TESOL cert from Trinity College London so I think I might try to get a part-time job teaching English to immigrants and refugees in Glasgow or Edinburgh. Not sure if they'll hire someone with an American accent though.
I'd also love to be a volunteer interpreter (not a translator 'cos I can't read Chinese well) for the NHS if they need someone to help them with Chinese patients who can't speak English.