I think it's great you want to start a new decade sober and aware! Whatever prompts you to make such a wise decision, go for it!! Anything that tricks the AV and empowers you is a very good thing!
For me, milestones would be more the opposite. I'd probably be on a last bender if I tried to pick a specific date to quit which would start the whole vicious cycle over again. I just sort of fell into the date I stopped because a friend's bad experience with alcohol hit home for me instead.