Who pays the return ticket back home upon a limited contract ending?

I will be ending my contract on the 25th of June 2021 for a limited contract. Do I need to write a cancellation letter? Or notice letter? Or it will expire on the said date?

Secondly, for these 2 years, I did not travel for vacation. What will be my benefits?

Who pays the return ticket back home?

In case I get a new job, when do I leave as per UAE law to join the new company?

Can I move at the end of the contract or at the end of my Emirates ID?