@KerryMitchell It's a genuinely interesting question because as a Finn, it doesn't always feel like the happiest place on earth and I think most Finns would squirm a little at that label. We're not really a "loudly happy" culture.
But I do think we've built some things well, and it's worth being honest about that. Free education at every level, universal healthcare, low corruption, a legal right to access nearly all forests, lakes and coastlines (Everyman's Rights), and workplaces that in theory and often in practice actually value your time outside of work. Trust in public institutions is high, and income inequality, while not perfect, is significantly lower than in most wealthy countries. Those aren't small things. They shape the texture of daily life in ways that are easy to take for granted.
What the happiness ranking really measures, I think, is whether the basic machinery of a society is functioning, whether people feel safe or whether they can make real choices about their lives, and whether bad luck or a wrong turn doesn't completely destroy you. By those measures, Finland does reasonably well.
That said, there's plenty that's wrong or struggling here too housing costs in cities, an ageing population, mental health challenges (the 6 months of dark winters don't help despite your location, in the North it's dark all year), and a political conversation that isn't immune to the same pressures pulling at other European countries. The happiness ranking can sometimes feel like it belongs to a slightly idealized version of Finland that glosses over those things.
I think the honest version is that we've made good structural choices over decades, and those compound. It's not magic or national character, it's policy, and it's fragile. You have to keep choosing it. Just my 2 cents.