I had a similar problem at the start of the year, averaging just under 40 putts a round off 12.

I am now down to around 30 by following three simple rules.

1) Grip down on the shaft
My grip is now just short of touching the bare shaft.
This gives me much better control (or maybe the illusion of better control) but it also allows me to make an accelerating through stroke.

2) On longer putts take 2 or three practice swings while looking at the hole, then step and and putt without any delay.
This means that you get yourself aligned first, but a few inches to the side of the ball, get the feel in your hands/body and move in and hit.
Allows your mind/body to control the distance on longer/llag putts.

3) On the short putts (8 ft and in) I pick my line then I watch a blade of grass between my putter face and the ball while I make my stroke.
I dont look at the ball as I had a tendency to follow it into the hole with my eyes and miss a lot of short ones left.