Wildlands does not have a true New Game Plus mode. Using a save editor, you can reset story missions while retaining all your weapons, attachments, and skills—creating your own NG+ experience.
Before using any editor, you must find your local save directory. The path depends on which platform you use to launch the game:
Use the save editor exclusively in offline mode or with friends who consent to modded gameplay. Never use it in Ghost War PvP.