The problem is, of course, that you cannot simply decide to care about something. If you do not care about something, your will cannot simply establish a caring relationship to that thing. It is rather a question of being open to possibilities of caring
In the early 1900s, psychoanalytic theorists speculated that people became bored out of unfulfilled unconscious desire. Midcentury existentialists such as Jean-Paul Sartre, by contrast, saw boredom as a fundamental philosophical crisis, what Schopenhauer once termed "the feeling of the emptiness of life."
Meaninglessness is boring. Boredom can be described as a meaning withdrawal, in analogy with drug withdrawal, as a discomfort that tells us that our need for meaning is not being met.