What can you do to be remembered for thousands of years? when all else seems, over time, to be broken, buried, burned, banned, bananas? Build.
Build an impressive ruin out of igneous rock.
Chip mysterious symbols into the sides. (Better if they don't mean anything.)
It'll be promoted by the size and the people arguing what the sumbols mean, and ethnic food.
People will flock from around the world to gawk. If they spend money, the locals will protect it.