Not being able to encounter NPCs in the game.

Hello, have a good day. I've played and finished the game for over 30 hours. During that time, I only encountered Gwennen once. I haven't encountered any of the other NPCs and I still can't reach them. They don't appear on the main map or on the maps I've created, so I can't complete the quests. I can't figure out if I'm missing something or if there's a bug.