Get the gimme range

Three putts are one of two problems. Either you don’t lag putt well or you have the”yips”.
Both can be controlled from over thinking and negative vibes.
Try one drill for both problems. Once you have aligned your stance and the putter face to your intended launch line, look at the hole instead of the ball, then stroke it. This is a great practice drill, at the least. Jordan Spieth even used it last year in competition. You feel the distance and quit watching the blade while in motion.