We work hard in our life to accumulate all things, hope enjoy it in the future, but, what happens when you are gone?

Physical things are only physical things.
Including our physical human bodies.
But we are not really physical.
Love and true happiness are the most important things. We carry those with ourselves.
We will not be gone.
Being born on Earth is not the start.
And the so called dying is not the end either.
They are both transitions.

I would recommend reading Near-Death Experiences (NDEs).

There are thousands (currently 5499) on the website of NDERF (Near-Death Experience Research Foundation), and it is constantly/regularly updated.