New Year’s resolutions
Most people don’t follow through with their New Year’s resolution and I’d reckon the vast majority of them are also aware of this phenomenon. This is just my speculation, but it’d seem the awareness alone could make someone less likely to succeed. If you have this idea that most people quit on the thing you’re attempting, when the going gets tough you may falsely believe it gives you a free pass to give up too. Whereas if you started at any other time- let’s take the middle of March for example- that extra social reinforcement is absent.
Everyday is a new start, not every 365 days.