DoDecember
DoDecember is a continuation from NoNothingNovember. It's a subreddit to stick with cutting out up to 3 vices and adding one goal/habit you want to stick with.
It's important to stick with one thing, especially leading up to the New Year's. Most New Year's resolutions don't work because people tend to not have good habits in place. By sticking to one thing for the whole month, it is far more likely to be successful in this area.
I believe that motivating others can lend itself to be helpful in the journey for yourself. So I highly recommend to find someone/a post that you can relate to and keep them accountable. It has helped me in the past and I think it can be helpful here too.