I have an old-school D&D campaign planned out. 1st-level, rural town. Like a reverse scooby-doo - small trivial problems like lost livestock resolve to hint at deeper mystical evil. As they level up they’ll find dark cults and demonic influences. The peaceful rustic countryside is far from what it seems.
But the players never get it together enough to set up a good date. The last campaign was fun, and they all said they wanted more. So I just keep writing more NPCs and extending the setting.
That seems to be the way it goes DMing. Spend many hours planning things and then everyone cancels repeatedly because they just…made other plans on the day we usually play. Plan a sequence around a character and then the relevant player doesn’t turn up that session. We’ve been in the first act of our campaign for 7 months. Played 10 sessions.