Practice swinging with your front foot turned out almost to the target which will stop you from shifting your weight to your front foot on the backswing
When the clubface rotates the heel becomes the leading edge of the club and makes contact first so practice making dollar bill divots to eliminate that clubface rotation
Use a two by four on the ground to represent your impact position and practice slow swings working on getting the clubface to come down square to the two by four with your hips opened, your left arm high and your right arm low