This is one thing that would make you feel worse if you try to intentionally have it.
You can't get self-worth just by wanting self-worth and trying to convince yourself you are worth something - perhaps made even worse by others' judgment of such a subjective topic.
The stigma if you admit you might not actually have self-worth is REALLY strong! Thus, most productivity advice talks about this to the point that hyperinflation of people talking about self-worth makes people consider that they lack self-worth (in comparison)
Beyond the human worth that others already have - indeed, such a subjective topic might not be worth worrying about or talking about at all.
Worth is abstract concept, life is objective concept. And is grounded in reality I guess. So lets not devalue life even if they don't feel worth, or others don't think they have worth! Life is still life.
Related: Inherent worth