Just ignore them sunk costs.

Definition of sunk costs: A sunk cost refers to money that has already been spent and which cannot be recovered.

Broaden the sunk costs definition to include EVERYTHING that you invested in the past: money, time, resources, emotions, friendships, family, ideas…

If what you really want to do is move forward, it just doesn’t matter what you did in the past. The only thing that matters is what are you doing today and tomorrow.