What should I follow If I do not want to renew my contract, the contract or visa expiry?

Hi,

I'm working in a private company in Dubai. I'm for 6 years with them, and I'm planning not to do the renewal.

My contract ends on 27 May 2023 and my visa is until 23 June 2023.

Which one should I follow, the contract end or the visa end?

Which is the best month to render the notice period?