Stuck isn't a motivation problem. It's almost always a representation problem. The map you're working from doesn't match the terrain, so every step looks optional and every direction looks equally unappealing. The usual advice — push harder, break it into smaller pieces, just start — doesn't work because the problem isn't effort. It's the map.
Unstuck comes from re-sensing the terrain. Put the map down. Walk the site. Notice what's actually there instead of what the plan said should be. Nine times in ten, the friction you were fighting was a feature on the map that doesn't exist in the territory, and the move you couldn't see was sitting a quarter-turn from where you'd been staring.
What this lets stakeholders do: stop grinding against friction that isn't real. Spend the next hour sensing instead of pushing, and trust that the next step becomes visible once the map updates.
What's still open: what's the minimum re-sensing discipline — short enough to actually do when stuck, substantial enough to update the map?