I tried talking to the robobrains in the vault, a few people back in Far Harbor, and I even tried going back to the commonwealth, trying to talk to some people in vault 88, including merchants. I was doing the vault 118 quest, but just before I could complete it I ran into a bug that now won't allow me to talk to any named NPC's or merchants, therefore breaking my game since I can't buy or sell supplies anymore. Lately I've gone back to Far Harbor to do a bunch of the miscellaneous quests and explore a bunch, after I left the island last year after completing the main quest.