Often, we think that because we have failed to complete a task or meet a target, we have to start from zero. This mindset disregards everything you've learned and the journey you've had thus far.
The issue is not holding yourself to high standards; the problem lies in minimizing yourself and only seeing your shortcomings instead of celebrating the small wins.
What's your whale? I absolutely detest the feeling of being stuck. To me, stagnation is a whale, and the fear of being devoured by it motivates my desire to go forward.