A lack of connectivity between your lower and upper body causes the clubface to lag, so try this split-handed drill to get your lower body weight flowing through to the finish
We are looking to create a clubhead that is traveling down to hit the ball, so take your address position and straighten out your left knee, this will bring your hip back, move the shaft forward and straighten your left wrist
Increase your accuracy and control by playing the ball slightly back in your stance and shortening your swing