My air condition unit will never meet desired temperature during daytime. Its 11 at night and its 85 with temp set at 73 fan is on outside on unit had antifreeze put in month ago air barely blows from vent what could be the problem?

Antifreeze? Freon perhaps ? Could be a dirty filter regarding airflow. Depending on ductwork, insulation, solar load, windows, venting etc, your AC may be doing the best it can. Do you have tree shade or just sun? Measure the outlet temperature and if it is at least 20 degrees under ambient your AC is fine.