There is a rule you all should know about productivity that I would like to share with you. It requires our energy to do anything and take any action, which is a limited resource that we must use effectively if we want to succeed and reach our goals. So if you are feeling maxed out completely with your current life style you won't be able to add in something. Examples: Tracking your macro nutrients, starting a workout plan, socializing with your friends or making some, adding a hobby, developing a meditation practice etc.
The rule is if you are going to add something to your daily routine you must get rid of something else to offset the energy expenditure of your new task. In short, if you want to pick something up you must put something down. This is the reason the majority of people create a new years resolution and stick with it only until January 31st, they haven't accounted for their increased energy expenditure and burn out very quickly because they haven't put something down. The statistic as recently as I've heard is only 9% of people make it 6 months with their new years resolution.
An unpopular cultural opinion but honestly the truth, there is no perfect condition to start anything new. The new year isn't anything special and doesn't give you any advantage on picking up a new habit or adding productivity to your schedule. Starting is the perfect condition! Jim Rohn is a famous older personal development guru that actually mentored Tony Robbins who now has over 100 companies an is doing north of 12 billion dollars a year overall in his companies. Jim Rohn has talked on this point about starting and his main concept in his message is you can change at any moment when you decide you are going to change. The only requirement is you make a committed decision mentally to change and have a strong why to keep you pushing through the rough patches that will always appear. Most people have this desire to reach a point where there are no longer any problems in life. A quote from Chris Williamson who runs the Modern Wisdom podcast on Spotify "Problems are a feature of life, not a bug. There will never come a time when you have no problems."