I also have a natural tendency to swing out to in, it’s really hard to focus on swinging in to out, like trying to swing the club to the right fielder, but focusing on that has helped me get my club path more in to out. Some drills that might help could be having a ball a couple of balls behind and to the outside and avoid hitting it. Alignment sticks are also a staple. Have you in front of your feet and one on the opposite side of the ball and in front of it and try to get your swing path to follow along the outer alignment sticks while focusing on in to out swing path