How do I get my current visa canceled?

The employer is responsible for the procedures for canceling the visa and the employer must submit to the public administration a request to cancel the visa and the worker must within thirty days from the date of canceling the visa, either submit an application to obtain a new visa based on the existence of a new work contract or leave the Emirates, and then you should follow up with the General Administration of Residence in order to cancel the visa
If the employer refuses to cancel the visa, you can file a complaint with the Ministry of Human Resources and Emiratisation.