If you jack it up can you move the wheel with your hands and try to feel for any play in the suspension? Bad ball joints or tie rod ends will let the wheel move a little bit. You might be able to feel it in the steering wheel too, especially if the good side is jacked up.
I think when you adjust the alignment it’s due to hitting a pothole and bending something or parts wearing out. The alignment doesn’t just go bad on its own after years of driving. So just fixing the alignment doesn’t really solve the problem completely. On front wheel drive the wheels will toe in due to engine power. So if you adjust for that then when you’re coasting they’ll toe out and start wearing again.