On what to do with life when neither happiness and death are within reach.

Devote your life to something bigger than yourself. Death is a certainty. Shift the mindset away from 'will this fix my problem and make my life happy' to 'what kind of place do I want to leave behind.' Simply existing, without any cause, is pointless suffering. Accept pain as a part of living we cannot escape, so we might as well put it to good use.