It is necessary to make more efforts on the recruitment channels in Shanghai. You can try websites and mobile apps, but the resume investment is very large. And the screening is also very slow.
Consider looking for a company to handle social security in Shanghai. There are specialized companies that can help. It can be a professional company or a company of your familiar friends. You can work part-time as a "financial consultant and management accountant" for them to meet your requirements.
There are also some, pay social security, pay wages, and there will be hundreds of service fees every month.