Short answer
The best time to start a habit is a day after which you can repeat it tomorrow too. If you want a meaningful start, tradition favours the waxing Moon (Shukla Paksha, from new Moon towards full Moon) for beginnings, on a day outside your Chandrashtama. A festival or the start of a month also makes a natural fresh start.
How ChiChakra reads this
ChiChakra reads this through the Moon, which governs mind and routine in Vedic astrology. Your Moon-sign forecast shows the general climate of the month, and the Chandrashtama tool flags the roughly two days a month when energy tends to dip. Saturn, the planet of discipline, rewards slow, steady practice.
Making it stick
Pick one small action, tie it to something you already do each day, and set a minimum for busy days.
Mark your Chandrashtama days in advance as light days: keep the habit, but shrink it.
Review after about a lunar month, roughly four weeks, and adjust what isn't working.
Good to know
For a new diet or exercise plan, check with your doctor first if you have any health condition.