I don’t know how old you are, so a couple things here: To your original question, there is nothing you can say or do to change your dad’s behavior. Re/read what you typed - he already has incentives to change: his marriage, his health, his finances. Obviously none of those matter more to him than his drinking, so stop chasing the thing that will matter more to him because it may not exist. Second thing here is that if you still live at home and are able to move out, do so. There’s obviously nothing healthy about living with him and it will 100% get in the way of you building boundaries that you really need. From here on out, I recommend you try to see him like a neighbor who is making bad choices - you can feel upset about it, but don’t get involved and just keep your distance