Welcome to SR! I don't know yet if you've posted in the Adult Children of Addicts/Alcoholics section, since I haven't made my way there tonight. Start working on your own recovery first before approaching your dad. You may find it's not quite time yet, or that it may even be a futile effort if he's not in the space of wanting recovery for himself. You should be your own main focus, as I'm sure you know that no one can change your dad but him.