Help with my urban fantasy plot

[snowynight]

This's a urban fantasy setting set in recent day New York, with supernaturals such as faerie and mages.
There're three main characters, a social worker suddenly can see the supernaturals, a college student with faerie heritage and a mage who's also a hacker. Right now  it has two main plotlines: different vampires who compete with each other to be the prince of New York, and two factions of mages are in a magical equivalent of nuclear race. However, I can't find a way to connect them. I think of eliminating the vampire plot, but I really like the idea of vampires as a common enemy to bind my main characters together. It also allows me to have a vampire as an unreliable ally who sometimes gets my characters into trouble for his purpose, so I'd prefer to make the vampire plot a bit larger. So help?

Comments

[yamx]

I haven't read all the other comments, so this might be a repeat, but--maybe there could be some kind of magical artifact all factions want/need? Or possibly a person everyone's looking for because she could help them with their goals through some power or knowledge.

[snowynight]

Thank you for your reply!
I think my characters can be very useful as pawns or a threat. They are among the few supernatural to know the others' existence. My fae child's useful to the mages to help them in their nuclear race because they can use her to navigate faerie realm to get power. My social worker can sense supernaturals and resist mind control magic or power. But my vampire is smart enough that he won't directly harm my fae child (or leave any evidence) because my main charactrs combined can be a real threat to vampires. I guess I need a way to link them stronger.