Residency Visa Extention

I live and work in China. I came to the US in February and was unable to return to China due to the travel ban. I still have an apartment and other responsibilities in China that I need to take care of. My job has allowed me to continue to work online and my contract with the company will end in July, but my residency visa expires in June. How do I get a visa extension until I am able to return to China? What steps should I take to keep my visa current?