Ac/heat not blowing air out of main fans

So last year my jeep during the winter stopped blowing air out of the 4 main fans. I drive a 2009 4 door.
The air will blow at my feet if I change the setting to feet. The air will blow towards windshield if I change the setting to windshield.
I’m having trouble knowing how I can fix this issue or what to research in order to get this issue fixed. Anyone know what I need to do to fix this?