Goalkeeper keeps carrying the ball right to the edge then panics

I’d look at the outfield movement first. If the keeper catches it and every teammate stands behind an opponent, telling the keeper to release earlier does not solve much. The players need to recognise that the restart has already started: move away, give an angle and show somewhere useful. Then help the keeper scan before they collect the ball so they already have an idea where the first option might be. In training, restart every little game through the goalkeeper for a few minutes. The moment the keeper gets it, the outfield players have to move straight away. I would keep the keeper’s message simple: look early, choose, release when you see it. If they are carrying to the edge because they are waiting for movement that never comes, it is a team problem rather than a goalkeeper problem.