As the other commenter pointed out - the starbursts are caused by light going your aperture. You can minimize that with a larger aperture but that will also narrow your depth of field. Some more info here.

The light trails are nice. But the background is a bit "meh" to me. It's mostly just dark empty space. I'd try to find somewhere that has more interest in the background. Maybe some shops, or other lights that will contrast with the light trails?

The stars are due to a point light source going through a small aperture. You're seeing the leafs of your lenses aperture. You'll see the starburst effect in movies pretty frequently.