I would recommend against using a plot generator, as in my experience they are traditionalist to a fault. They seem more like cliché generators.
Speaking of clichés, if you truly don't have any idea how to begin writing a novel plot, take a cliché and reverse it, or more to the point, seize on something unexpected.
Maybe a gifted warrior who turned to pacifism after becoming disillusioned with war needs to hunt down a homicidal child whose psycopathy makes them a threat to any who cross their path, and the warrior needs to reconcile his aversion to violence with his preceived need to stop the child by any means necessary.
Or turn it around. Maybe you play as a child with a macabre gift for murder, and the only victim to ever get away was a near invincible war veteran whose sworn never to turn to violence again, and his repeated run ins with the child always results in a strange stalemate where the child seemingly cannot kill the war veteran, but the war veteran is unwilling to respond with violence to ever put the child in jeopardy. And so now the child hunts the war veteran across the world as he completes some kind of spiritual pilgrimage, with the child trying to find new and increasingly extreme methods to finally claim the life of the only one to ever get away.
Point is, just start somewhere. Anywhere. Then turn it around and make it work in reverse. Or turn it sideways. Or inside out. You'll end up finding new and interesting ideas to work from.