Being close to nature is spiritually uplifting. It connects us to something bigger than ourselves and reminds us that the universe continues beautifully and powerfully whatever is going on in our lives. "Consider the lilies of the field, how they grow; they toil no, neither do they spin." Matthew 6 vs 28.
This can be as immersive as a walk in a forest or a swim in the ocean, it can be as awe-inspiring as gazing at the stars on a clear night. But if you're in a city or otherwise unable to engage in those ways, look in wonder at any leaf or petal or seed. How it grew, how it is structured, how delicate it is, how strong it is, how it came from the earth.