You have to apply for a new work visa to Hong Kong, just prepare all documents and have a new start for the application, your employer also needs to provide One copy of the employer's HK ID and the employer's telephone number;

You need to provide the below documents
One copy of the standard employment contract signed between applicant and employer. The contract shall be authenticated by the consulate of the applicant's country in HK.

Proofs of previous working experience as a domestic helper;

A Physical Examination Certificate issued by accredited hospital.

Passport/travel document with blank pages and a validity of at least 6 months.

One completed application form affixed with one passport-sized photo.