You said it very well; because death is a fact of life, we should not fritter away our time on trivial matters but rather devote it to activities that will have a positive impact on our lives. Because we will not be able to retrieve any time that we have squandered in the past, we must make the most of each and every minute that we are given here on earth.
Yes, time only goes one way, and for humans has a limit, so it seems like a smart thing not to waste any with valueless things, although many do. I think we've all wasted time at some point, but knowing that and rectifying it is the main thing.
Thanks for your comment.