Hope you're acting ironic by saying that you can commit a genocide, put your gun over the fireplace you murdered a family to steal, and suddenly not be a valid target.
It doesn't matter if you put your gun down as a settler colonizer. You're still actively engaging in the genocide. You are still a valid target.
And the objective of any just war is to expel you.
Normally, they should first be offered to surrender.
Get on a plane and go home. No one's stopping you. That's your opportunity.