Always new POIs in quests. There are no quests in the visited locations.

[PaTi6op]

Tell me, I don't know in which direction to dig yet. I want to make sure that the merchant does not give tasks in POIs in which quests have already been completed. For example, there was a prison quest, and that's it. There can be no more quests there. Is it really possible to do this at all?) Or am I dreaming? So far, I only understand modding. It's probably still too difficult for me. But I will be glad for answers or advice.