biome evolves after periods of gameplay/trigger event

As you progress in game and more biomes to explore, you also build bases in biomes you favour.

As a result you often do not revisit old biomes. Create reasons to go back to old biomes i.e., mission, new creatures appear, biome evolves etc.

Currently when playing multiple hours, and revisiting old biomes, it feels empty and feels like a place you just either take resources and go back to base and feels less mysterious, like Ash ketchum visitng pallet town after you complete champions league.