I would suggest you to get register at Bayut and enlist your property over there to get good exposure. Any buyer who is interested in buying your property will surely contact you back. You can also purchase "Hot Listing" for the maximum exposure as your property will appear at the landing page of Bayut.
For a prompt response, I would suggest you to contact agents from the "Agents" section. They can help you getting good buyers for your apartment as soon as possible.