I agree with the other comment, you have a decent log-line, but if it wasn’t there i would have no idea his name was Jacob, he had a girlfriend, she disappeared, or dreams are involved.
The trailer starts to become random clips after around 20 seconds in, I can see how some of the clips are connected, but it’s still pretty random, a lot of the clips are pretty framed nicely.
Also your post work could use improvements, Color doesn’t seem bad but it doesn’t look CCed either which could make it look better. Your camera movements seemed a bit shaky in many clips, which can be fixed with better filming equipment/techniques, or just stabilize it in post (will crop it a bit).
The sound that is present makes the rest seem like silence (except for the music obviously), you could add some more sound effects, like the beginning could have some soft wave noises. The noise that is present should be edited to remove background noise and just sound better in general. (Trust me it will sound a lot better after adobe audition, or audacity), This video is pretty good, https://www.youtube.com/watch?v=fknmkG0mPzw&ab_channel=FrontPageTech but it’s mostly for voice, but there are somethings that don’t apply just to audio.
Sorry if i seem negative, I kinda tend to notice things that aren’t as good, and just mentally ignore the good parts.