Before a new chapter is begun, the old one has to be finished: tell yourself that what has passed will never come back. Remember that there was a time when you could live without that thing or that person – nothing is irreplaceable, a habit is not a need. This may sound so obvious, it may even be difficult, but it is very important.
Closing cycles. Not because of pride, incapacity or arrogance, but simply because that no longer fits your life.