Hi, i am an ESL teacher IN China from last 5 years, i came to see my family in Pakistan,later stuck

My school closed down and boss filed the bankruptcy , my wtk permit is valid with the school but residence has expired , means cant get Pau letter. I have got few other offers but they say visa cant be transferred because i am outside China, i wonder what's the other option for me without PU letter to go back to China again?