If you want an easy time, do what the guy above me said. If you want to stick with Mara, thick and thin, then you need work on your rotation a bit. 1st, your Gore window is 3 seconds, so it's imperitive that you get a devastating blast in there at some point. If you can fit a ravage and a DB in on the same gore window, that's even better. But DB is more important than Ravage.
Granted, I'm no pro at Mara and I don't necessarily follow rotations so I'm probably not the best person to listen to.