Set up two hula hoops about a foot apart on your swing plane angle and then swing through the gap between them
Focus on your left wrist at the top of the backswing and start of the downswing to get to impact properly, many players have a cupped left wrist which changes the angle of the clubface, this causes an open clubface and results in casting and manipulation during the last portion of the downswing
The easiest way to reshape your golf swing is by using a pole, stick it in the ground and make sure that your swing goes up and down the pole on the same path and just like that you will hit it straight