One must develop a reasonable concept of effort. One way to develop a reasonable concept of how much is enough is to truly incorporate the bromide of 'Having Done One's Best'. It is reasonably easy for most people, unless they are incapacitated by clinical levels of depression more suited to medication than words, to judge when they have more or less done the best that they can. To judge that one has done one's best, within the time available, with the available resources, and under whatever duress was ambient, is useful in learning how to determine when one has done enough. A last part of relating to action in the world is actually remembering the things one has done, and thinking about them.
Self reflection is important to self worth.
One must make the effort to consistently, and as dispassionately as possible, reflect upon the actions one has taken. The important part here is not to fuss over the action, but to be able to feel the sheer weight of the effort. One has to actively make one's own actions count. Self worth is constantly being sapped and demolished by the nature of our society, and even the physics of our universe. A person is responsible for their own happiness, and also for their own self worth.