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Don't do too much, or you will waste time and efforts
(ttrpg.network)
You can of course plan the big lines of the campaign, but the more precise you get and far ahead of the present, the more you will either lose or railroad to not lose. Both suck
What is "plan?"
Lol, my brother! I never have a plan. I built a bunch of encounters and quests on roll tables and have them as posts on the board in the Adventurer's Guild. They have tons of agency because I am exploring the world along with them.