Reputation is your victory condition, and Resolve is the engine that drives it. Beyond basic needs, strategically provide luxury goods and services that cater to multiple species. For example, a Tavern can satisfy the Leisure need for Humans and Harpies, and also produce Ale for Beavers.
Leverage the Hearth's upgrades for significant Resolve and Reputation bonuses. During the Storm season, when Resolve is most challenged, activate temporary buffs from Cornerstones or consume specific goods to counteract the negative effects. Don't underestimate the power of a few extra Resolve points across your population.