Existential feelings like anxiety, loneliness and our purpose in the world are very powerful, we have all felt them. If they are conveyed in the right way then we can sympathise with the characters and empathise with them during their struggles. Unfortunately this movie did not provide me the opportunity to do this.
This movie was let down in two ways, the material and the characters. There was not enough material to make a movie. Vacuum cleaning and showing the same thing over and over again are two examples. Secondly, Boshra Dastournezhad's character who was the main character was going through an existential crisis. He had moved to the US expecting more, expecting to be able to make positive change, which is admirable. However, his despair was lost for me in the fact I didn't like him, and thus didn't care for him or his despair. No connection was built with him as there was nothing to like about him. All the other characters where one dimensional so there was nothing to be gained from them either.
The writer tried to manufacturer a connection with the audience through the prospect of Metallica. But as the movie slowly dragged on I lost interest in whether or not Metallica would show up anyway.
See Into the Wild or Lost in Translation if you would like to see an existential movie where we connect with the characters and there is actually enough material to make a movie.