The question that you need to answer is:
What flattens all mountains, wipes out all species, destroy every building, and turns everything into pieces?
Time flattens all mountains from a phenomenon called erosion. erosion is the action of surface processes (such as water flow or wind) that remove soil, rock, or dissolved material from one location on the Earth’s crust, then transport it away to another location. So when the time passes mountains got flatten.
Species do have a certain living time. They can’t live infinitely. Also it is the same for the buildings. When time passes they ruin.
Don’t waste your time doing things that make you unhappy. Time is precious. Time is our most valuable resource because it’s nonrenewable.