Can I start with a clean sheet, drawing up myself from zero? No, obviously I cannot; there's history and there are commitments.
But I can rediscover myself. Perhaps some old likes, dislikes, and habits can be dropped? I can question what I believe are given facts, examine the way I live my life - and adapt it to the "me" where it is now.
So I actually do start with a clean sheet in front of me, to find out how I can make my life reflect my values more, and if I spend enough time on what is essential.
If I were to die tomorrow, I want to be satisfied with a life that has not been wasted.