You

 Not me.  You.

Not the accusatory you.  It's the personal you, It's individual and group.  It can be an arrow pointed at the heart, not to harm, but to motivate.  To be made available.  

It starts with you.  You have to figure out what you can do.  You see what's going on and something resounds.  Starts with a tick then a bang and soon an engine running.  

1 you then 2 and more and more.

Can't tell you what to pick.  Whatever touches you.

So what makes you tick?