I agree with you that purpose in life is very important. However, your assumption above about Denmark is not supported by The World Happiness Report (https://worldhappiness.report/ed/2019): both in 2019 and 2018, Denmark was at the very top (the 2nd place, after Finland). One could argue that many, if not the most, people, not having to work or having to work less at a normal job, might very well express themselves (and contribute significant societal value) by participating in entrepreneurship, innovation, part-time employment, creative arts & crafts, caring for their kids and/or senior family members, volunteering and much more.