One of the common faults you see often in amateur swings is executing the backswing with their shoulders level to the ground and their weight over their back foot too much. This will cause the club to get stuck behind you in the backswing, which forces a rerouting of the club producing a lot of inconsistency in the ball striking.
In order to create a nice wide arc with the clubhead, put your arms on top of your chest — not to the side of it — with your trail elbow feeling like it’s more tucked against your ribs. This will keep your clubhead out wider longer and deliver a nice tilted shoulder plane, which will result in better contact.