If you have beaten the game once, NG+ allows you to start at Level 1 but keep all your abilities . You will rip through the early game like a god, hitting Level 15 in roughly 90 minutes.
Ubisoft officially sells on the store. For a few dollars, you can buy a "Ability Point Pack" or "Resources Pack." This won't give you a Level 15 save, but it will allow you to steamroll the early game to get to Level 15 in about 2 hours. assassin 39-s creed origins save game level 15