For me I think reconnecting with nature gave me back a sense of what is real and what matters. Spending time away from screens, and outside with plants and animals.
It might sound corny, but I really think that so much meaning and purpose in our lives have been lost, as we insulate ourselves more and more from nature. The natural world is now an inconvenience, in the way of progress, rather than the thing which sustains us.
The cycles of nature, the seasons, it's all a circular process where everything works together - when something dies, its' decomposing body nourishes something else. There's a beauty to that, and an interconnectedness. To me it makes me realise my place in the world - I'm just part of the system, here for a short time. As a previous poster said, there can be comfort in knowing that there is no point. You're not doing it wrong, there is no wrong.
That being said if you have generally followed the 'life script'... university, marriage, children, mortgage etc etc. There's always the next box to tick...but eventually, when you have ticked all the boxes, comes the what next, or for some people the realisation that the life script hasn't delivered on it's promise.
Maybe have a think about whether there is something else going on in your life that you are unhappy about. I don't mean to say that you necessarily are unhappy with your lot, but the existential crises do tend to hit us most when we have done what we are 'supposed' to do, as instructed by society, and yet it still doesn't fulfil us.