What's the one thing that's keeping you going in life

Kinda deep but I just wanna know what's peoples motivation and drive in life to keep on thriving. Been feeling in the gutter lately and I've slowly sunken into pessimistic thoughts even though I'd like to think I'm optimistic.

Everything nowadays feels like a blur and the present is but a fleeting moment that doesnt give me any clarity and reassurance for the future, but who knows, maybe this is just a one time thing and I just need to go for a walk to clear my head.