Complete All Other DLCs
Far Harbor is the third of Fallout 4’s DLC offerings and is the largest of the three. Coming before it, Automatron had us battling against, and building our own robots with a short quest line. While it didn’t take all that long to finish, it did offer some pretty sweet rewards for doing so, which could come in handy as you set foot on Far Harbor. As for Wasteland Workshop, it couldn’t be completed per sé, but it did offer plenty of new additions to the settlement building aspect of the game.
Therefore, it’s always a good idea to make sure you’re all done and dusted with previous DLC, not only so you can make use of all of those cool new weapons that you picked up, but so that you can also build a really sweet settlement should Far Harbor include a new settlement location.