What is a real quick way to lvl up your sword?

[Bilgepump]

Group with others to get the rep bonus. You don't have to attack the same mob. You can group and go off and do your thing. Note: Currently, the bonus applies as long as you're crewed, no matter what zone each person is in, but they say they're going to change this so you have to be in the same zone.

Avoid grey or green level mobs.

Attack yellow and red level mobs.

Without knowing your rep or cutlass level, I can't give specific suggestions on places to go. Just look around, don't be afraid to explore.

Oh yeah. Do NOT go to a high-level area and try to "help" other players kill things. All you'll do is annoy the other player because you're taking their rep.