The meaning or lack thereof of life doesn't abrogate your responsibility in life: to change the world for the better. This could be as impactful as being the architect of a world-historic event and it could be as modest as being a good role model for kids who will grow up to not fuck up as much as you. But everyone has this responsibility, and this responsibility is completely orthogonal to whether life has meaning or not.

There's nothing more meaningless to question whether life has meaning or not.