1. Picking liberty and not expanding past 3 cities. 2. Obsession with certain wonders. I actually tried to challenge myself several times not to build a single wonder, failing every time. 3. Inability to create a strong religion, which is fine if I was content with not going for one, but I do invest in it and then get a very mediocre religion at best that can't compete with others. With founder beliefs that net me little to no good, like ceremonial burial with 3 cities following that religion. Or interfaith dialogue without a good enough faith output to spam missionaries. OR... 4. Create an awesome pantheon that's so spot on, it propels my early game nicely, failing to found a religion, getting the pantheon wiped out shortly after 5. Being so extremely annoyed by (totally incompetent) carpets of doom, I can't make myself play past king, stack at often playing on prince creating artificial handicaps for myself in order to try to level the field a bit. Not going obvious beelines in tech, wonders, neglecting military, no worker stealing, no XP farming and whatever things I can come up with. Inevitably always becoming a runaway and exiting the game.