Advent teaches us that even when God seems to be absent, he is still God-with-us.
The Prophets of Advent call us to repent. They tell us that a little pain now is worth being able to greet Jesus with joy when he comes again.
If you want to begin again, you can, you can do it any day and every day. Give thanks to God. That thanksgiving will lead you to love, and that love will lead you to action grounded in the hope that is in Christ Jesus, who will come again.