Practicing smart must include identifying problems both acute and chronic. Practice simply. Half swings and three quarter swings with an eight iron can't be hit perfectly enough. Bad contact must be fixed first. Feedback isn't useful if the ball wasn't hit squarely. Simple drills would include constant checking of form, alignment feedback, and a transfer-ability to every swing, club and shot on the course. Practice a strength. Spend time getting better at something you already do well. Hit chips, each with gradually shorter and shorter swings. Watch form and pay close attention to alignment. With perfect contact increase the length of each chip until a full shoulder turn equals a full swing.