Checking the wear on the tires can point to worn front-end parts. If your car was recently aligned, I would have expected the alignment tech to point out any front-end suspension problems and/or any uneven wear showing on the tires. I’m guessing that you might have some wear in the steering mechanism. A certain amount of play in the steering wheel is expected, but when it becomes excessive, a car will tend to wander over the road. Have the play in your steering wheel checked.