Start reading a green as you approach it walking or riding up, read the slope from the low point of the green paying particular attention to the area closer to the hole as the ball is rolling slower and will break more
Take your posture nice and tall, pull your rear end back so that it brings your shoulders and chest out and then just slightly unlock your knees, just enough to have some spring and tension through your legs
Too many players worry about mechanical and technical things throughout their swing and never focus on balance which is the key to a stable shot, see if you are in balance by trying to hold your finish position until your ball lands