From such a lie there are two optimal shots (or swings) to consider: Take a look at the photo below which captures the final shot of a 60-ball practice session at Augusta National with Mr. Short Game himself Phil Mickelson.
Lose your bent-over putting stance. Stand taller and closer to the ball (photo above left). It’s hard to give longer putts the needed oomph when you’re in a crouched position.
For consistency on this shot you need a very level golf swing and the ball positioned just past the bottom of your swing arc. The key is to pick the ball with solid contact without disturbing the turf beneath it.