I want to ask about my old labour card still...

The residence visa is not automatically cancelled after the cancellation of the work permit, but only the sponsor or his / her representative may request cancellation of the residence visa, and the sponsored person may not request cancellation without the sponsor's authorization and signature. The application is signed by the employer and the employee, accompanied by the employee's acknowledgement that all contributions have been received.
After cancelling the employment contract, the sponsor submits a request for cancellation of the residence visa to the General Administration of Residency and Foreign Affairs, which is allowed to stay in the State for 30 days after the cancellation of the residence visa, you must leave before its expiry or obtain a new residence, and when this period is exceeded without obtaining a new residence, it becomes an illegal residence, which exposes the violator to fines and penalties determined by law.
 If you can't cancel your visa, there is called automatic cancellation of stay. Staying for more than six months outside the UAE automatically cancels your residence visa. You must deliver your UAE ID to the General Directorate of Residency and Foreigners' Affairs. And Foreigners Affairs to hand over UAE ID cards returned to the Emirates Identity Authority that issued the card