Let the guilt go. Coming from a person in recovery who's lucky to have gotten out of that hole, just know there's not really anything you could have done if your father wasn't interested in seeking help. No amount of being there or showing understanding or talking sense to him matters. Good on you for not losing your 20s and beyond to that endless pit.
+1. I spent some time in recovery, and someone once shared that "Our help isn't for people who need it, it's for people who want it." That always stuck with me.
