Whenever you choose to deliver mediocre quality work
Whenever you think it is okay to slack in your work
Whenever you think it is okay if no one sees it but you in your heart knew you just ticked a box but did not put in your best work,
It always helps to put a note on your desk: I sold my soul for money.
If you are not doing great work and not getting better with time, it is time you sit down with yourself and get super clarity on why are you doing it.