You get about 365 fresh starts every year and most people spend them waiting for one big one.

Nothing about January makes a change more likely to hold. Waiting for a significant date turns a decision into an event, and events need conditions, which is why so many of them never arrive. Every morning is structurally identical to the first of the year.

Start the thing on a random weekday, which also lowers the stakes considerably. Do a small version today rather than a complete version in eight weeks. If it collapses, tomorrow is another one of the same, and that is the whole advantage.