1. The nuclear family model is overrated in many cases and has contributed to environmental issues. It makes more sense, unless you don't get along with family, to live in a multi-generational household. Growing up I saw those from Asian and Indian backgrounds make fast economic progress in my small town as they shared their resources.
2. North American food culture is a model to avoid. This is changing somewhat but, again, Asian and Indian food cultures have done so much more with less and with much better health outcomes and, imo, taste.
3. It doesn't make sense for young adults to leave home as soon as possible, again assuming they get along with their family. It makes way more sense to stay at home and save your money until you are ready to buy a home.
4. Early child development, relationship skills, and parenting basics should be taught in school.
5. Financial literacy classes should be mandatory in school.
6. If happiness is the goal then more people should focus on spirituality/religion.
https://www.pewresearch.org/fact-tank/2019/01/31/are-religious-people-happier-healthier-our-new-global-study-explores-this-question/7. Having kids at an earlier age is often preferable in the long-term for health, emotional and financial reasons if you have family support. See one above and, in Canada, there are many financial supports for students with kids that make going to university and having children workable financially and via access to excellent university childcare services.