Is it possible to use the property for self or rent it after vacating the tenant to sell?

The complication will arise only if the landlord re-rents the property. If he wants to re-rent, the priority should be given to the previous tenant.

This is the law according to the situation. If you need further clarification you may ask.

Yes the landlord can live as per the UAE law.

The landlord is not entitled to re-rent the property; they are free afterward to sell it or not, use it personally, or leave it vacant without tenants.