Unplug the unit. You will need to gain access to the blower motor inside the unit. Try and turn this motor by hand. If it is frozen, lubricate it. If it is not frozen, you either have a burned out motor, or you have an electrical failure.
Most motor failures are due to
lubrication problems. It could be
lack of lubrication for whatever reason. It could
be contamination of the bearing system. If you don't
grease a motor, sooner or later it's going to fail. If you
lose grease in the bearing during cleaning, a failure is imminent. High
motor and bearing temperatures also will tend to dry up
the grease over time.
If you are not familiar with working on A/C units, motors, etc., I would recommend having a service professional repair the unit, or you can purchase a replacement. I’m happy to help further over the phone at
https://www.6ya.com/expert/jeremy_69f3cc28d95bf514